Part I – Setting the Stage: Why “6E” Matters Beyond One Lawsuit
| Executive Summary The ongoing trademark dispute between InterGlobe Aviation Limited (IndiGo) and Mahindra & Mahindra Limited has brought an apparently simple alphanumeric expression – “6E” – to the forefront of Indian trademark jurisprudence. The controversy arose in November 2024 when Mahindra unveiled its electric SUV under the designation “BE 6e.” IndiGo, which has used “6E” extensively as a commercial brand identifier since commencing operations in 2006, and which owns multiple trademark registrations incorporating the expression “6E,” initiated proceedings before the Delhi High Court alleging trademark infringement and dilution. Mahindra has maintained that “BE 6e” constitutes a distinct composite mark for a product operating in an entirely different commercial sphere. Following unsuccessful mediation, the dispute remains pending before the Delhi High Court. While the litigation concerns two prominent Indian businesses, its significance extends far beyond the parties themselves. At its core lies a fundamental question of trademark law: to what extent can a short alphanumeric expression acquire proprietary protection that transcends the industry in which it was developed? The case requires the Court to examine the boundaries between distinctiveness and monopoly, reputation and registration, as well as trademark protection and legitimate commercial competition. It also raises important questions regarding the protection of reputed marks, cross-class enforcement, likelihood of confusion, and trademark dilution in an era where minimalist branding has become increasingly prevalent. Rather than treating the dispute as a conventional infringement action, this article uses it as a lens through which to examine the evolving principles governing unconventional trademarks under Indian law. By analysing the statutory framework, judicial precedents, and comparative international approaches, it explores how the eventual outcome may influence future brand strategy, trademark enforcement, and the protection of alphanumeric identifiers in India’s increasingly competitive marketplace. Latest Update as of July 2026 Mediation between IndiGo and Mahindra Electric over the “6E” trademark has failed, as per a Delhi High Court order. The court has directed both parties to submit admitted documents and prepare a joint schedule for the upcoming hearing. The case is continuing because Mahindra’s name change to “BE 6” is only a temporary strategic compromise to avoid vehicle launch delays. Mahindra has not permanently surrendered its right to use the “6e” brand, and both companies want a definitive, legally binding ruling from the court. |
Introduction: When Two Characters Are Worth More Than a Name
There is a particular kind of brand that earns its power not through the richness of language but through precision and repetition. Not through evocation, but through ubiquity. “6E” is that kind of brand. It is not a word. It does not describe a feeling, a promise, or a place. It is an alphanumeric designator; an IATA code (a unique 3-letter geocode assigned to airports and metropolitan areas by the International Air Transport Association) assigned to IndiGo Airlines in 2006. Yet, two decades of continuous use, hundreds of crores of rupees in marketing, and the loyalty of hundreds of millions of passengers have transformed it into something the law must now take seriously: a mark with a life of its own.
It is worth noting that IATA airline codes, such as IndiGo’s “6E,” cannot be patented because they are not functional inventions, though they are trademarked to protect brand identity. This distinction highlights the boundary between protecting technical processes via patents and commercial branding via trademarks. These legal frameworks prevent functional codes from being monopolized while securing unique brand identifiers.
Across the world, brands have quietly abandoned the richness of language in favour of the efficiency of letters and numbers. BMW. 3M. DHL. 7UP. B2B. These are not abbreviations that explain themselves. They are marks that have earned recognition through use, consistency, and the trust of consumers who encounter them at every turn. The shift from verbal marks to alphanumeric identifiers is not accidental. In a digital-first, globally connected economy, brevity is a competitive advantage. A two-character mark is searchable, scannable, globally pronounceable, and crucially impossible to confuse with ordinary descriptive language.
That last quality is precisely what makes this dispute so consequential. When Mahindra Electric unveiled its “BE 6e” electric SUV in November 2024, it was not choosing a random identifier. “BE” stood for “Born Electric,” the platform architecture for Mahindra’s entire EV range. “6e” was a stylistic flourish; an internal reference, reportedly, to the phrase “Be Sexy,” aligned with the vehicle’s futuristic design. To Mahindra, these were distinct elements of a composite mark serving a single brand in a completely different commercial universe from aviation. To IndiGo, it was something else: an unlawful appropriation of nineteen years of earned goodwill.
This article examines that collision. It explores what trademark law actually protects when the mark in question is alphanumeric, what the competing legal arguments are, how Indian courts have approached cross-industry brand protection in the past, and what the eventual outcome of InterGlobe Aviation v. Mahindra Electric Automobile will mean for every brand owner doing business in India. The dispute is live, the trial is proceeding, and the principles at stake are significant enough to outlast both companies’ immediate commercial interests.
Section II — The Evolution of Branding: From Names to Alphanumeric Identity
There is a moment in the life of every great brand when it stops explaining itself.
Coca-Cola still tells you, in its name, that it is a drink. Rolls-Royce still carries the names of the men who built it. But 3M does not tell you it was founded as the Minnesota Mining and Manufacturing Company. BMW does not mention Bavaria, motors, or works. DHL does not announce the surnames of Dalsey, Hillblom, and Lynn. These marks have shed the biographical and the descriptive. What remains (the initials, the number, the letter) does not explain the brand. It is the brand. And that transformation, from name to mark, from description to identity, is one of the most consequential shifts in the commercial history of the twentieth and twenty-first centuries.
The dispute between IndiGo and Mahindra over “6E” sits squarely within this shift. To understand why a two-character alphanumeric identifier has become the subject of litigation between two of India’s most prominent companies, you first need to understand the commercial logic that made alphanumeric marks so valuable in the first place and why that value is accelerating.
The Architecture of Brevity
Minimalist branding did not begin as an aesthetic preference. It began as a practical response to an increasingly noisy commercial world. When every product competes for the same finite shelf of consumer attention, the mark that occupies the least space and delivers the fastest recognition wins.
‘3M’ with two characters carries no linguistic baggage, no category description, no geographic limitation. It is pronounceable in every major language. It implies neither the product it sells nor the industry it occupies, which means it is free to sell anything, in any sector, in any country, without the mark itself becoming a liability. The same logic explains why Kentucky Fried Chicken became KFC in 1991: not because the brand wanted to hide its product, but because “fried” had become a word the company needed to escape. Three letters freed it. The name had imprisoned it.
BMW presents a different version of the same insight. The full name Bayerische Motoren Werke is a geographical and categorical description that would have limited the brand’s emotional and international range. The abbreviation retains the precision of a manufacturer’s identity while acquiring the universality of a symbol. Today, BMW does not make you think of Bavaria. It makes you think of a particular aspiration, a particular standard of engineering, a particular relationship between driver and machine. The three letters carry all of that. The full name carries none of it.
This is the first commercial principle behind the rise of alphanumeric marks: brevity is not reduction. It is concentration. Every letter or number you remove from a brand name forces the remaining characters to work harder, accumulate more meaning, and carry more identity. When it works, the result is a mark that is simultaneously maximally flexible and maximally distinctive.
The Digital Acceleration
The shift toward alphanumeric marks was already underway when the Internet arrived. The internet made it irreversible.
In a digital environment, brand marks operate across contexts that did not exist when most naming conventions were established. A mark must function as a search query. It must fit within a social media handle. It must be legible at 16 pixels on a notification badge. It must survive translation into a hashtag, a domain name, a product SKU, and an app icon. These are not aesthetic constraints; they are functional requirements that systematically favour the short, the distinctive, and the non-linguistic.
What impact does “6E” have in a digital environment? It is a search query that returns IndiGo with near-perfect precision. It functions as a hashtag without ambiguity. It appears on a boarding pass, a mobile ticket, a flight tracking app, and an airport departures board with equal legibility. It requires no localisation. It is typed faster than any word. In the attention economy of digital platforms, these advantages compound. The mark that is faster to type, easier to search, and cleaner to render will, over time, accumulate more touchpoints and more recall than one that requires linguistic effort.
DHL understood this intuitively. So did 7UP, whose numerical identity creates an instant mnemonic that “Seven Up” would never have achieved. Jio 5G carries its technology generation in its name, collapsing a technical specification into a brand claim so that when India upgrades to 6G, “Jio 5G” itself will become a historical marker, a monument to a technological moment. OnePlus 13 uses its model number not as internal product nomenclature but as a publicly facing mark, training its consumer base to associate numeric progression with quality progression. Each new model number is not just a product launch; it is a brand event, because the number itself has been elevated from designation to identity.
This is the second commercial principle: in a digital-first world, the alphanumeric mark does not merely identify a product. It becomes the interface between the brand and the consumer across every platform where that consumer encounters it.
Memorability and the Science of the Short Mark
Marketing science has long known that shorter marks are more memorable, but not for the reason most people assume. It is not simply that they are easier to recall. It is that they are easier to encode in the first place.
The human brain processes alphanumeric combinations differently from ordinary words. A word activates language processing pathways that automatically search for meaning. An alphanumeric sequence, particularly one that combines a number and a letter, activates a different cognitive pathway, one associated with categorisation and coding. The brain treats “6E” not as a word to be understood but as a symbol to be stored. And symbols, once stored with sufficient repetition, are retrieved with far greater speed and reliability than words.
This explains G-SHOCK. Casio’s flagship watch range could have been called the Casio Endurance Series, the Casio Durability Range, or any number of descriptive configurations. Instead: G-SHOCK. The hyphen and the capitalisation give it a visual identity. The letter-word combination gives it a rhythm. It sounds like what it is: a watch built for impact without saying so in language. Two decades of advertising have made “G-SHOCK” a mark that communicates toughness, reliability, and a particular kind of utilitarian cool without deploying a single adjective.
F1 achieves something similar in sport. Formula One was always the full name. F1 is the brand. The compression performs the same function as the sport itself: maximum performance, minimum waste. When Liberty Media took over Formula One’s commercial rights, one of its first strategic decisions was to invest in the F1 mark as a brand asset, separate from the sport’s operational identity. Today, F1 is a lifestyle brand, a gaming franchise, a Netflix series, and a fashion collaborator. The two-character mark can carry all of those identities simultaneously because it carries none of their constraints.
The A320 completes this picture from the industrial sector. Airbus’s aircraft designation is a product architecture identifier that, in the hands of commercial aviation, became a consumer-facing quality mark. Frequent flyers know that an A320 is a narrow-body single-aisle aircraft with specific seat configurations and a particular cabin feel. They choose flights partly on the basis of aircraft type. What began as an internal engineering designation (a number within a family sequence) has, through decades of passenger experience, become a brand signal. Airlines advertise A320 operations as a quality credential.
This is the third commercial principle: alphanumeric marks, when reinforced through consistent and extensive use, acquire meaning by accretion. They begin as designators and end as identities.
Product Architecture and the Mark as a System
The most sophisticated use of alphanumeric branding is not as a standalone mark but as a system: a structured naming architecture that allows a single brand to extend across multiple products, categories, and markets without losing coherence.
BMW’s architecture is the clearest example. The numerical series (1, 2, 3, 4, 5, 6, 7, 8) communicates a hierarchy of aspiration and price. The letter suffixes (i, d, M, X) communicate powertrain and variant. A consumer who understands “BMW 5 Series” can decode “BMW M5 Competition” without being told what the letters and numbers mean. The architecture teaches itself. It is a language that, once learned, rewards loyalty with comprehension.
IndiGo built a version of this. “6E” as a root generated “6E Prime,” “6E Flex,” “6E Add-ons,” “6E Rewards.” Each extension of the mark trained the consumer to associate “6E” not just with the airline but with a specific tier or category of service. The mark became a system. And a system has far greater commercial durability than a standalone identifier, because each extension strengthens the root.
This is precisely why the Mahindra dispute matters commercially, not just legally. When Mahindra adopted “6e” as an element of “BE 6e,” it did not, in its own submission, intend to free-ride on IndiGo’s goodwill. It was constructing its own system: “BE” for Born Electric, the number “6” for the model’s position in the range, and “e” as an electrification suffix. In Mahindra’s architecture, “6e” was a subordinate element of a composite designation, not a standalone mark. In IndiGo’s architecture, “6E” was the root from which everything else grew. Whether one alphanumeric system can lawfully appropriate an element of another is, at one level, the entire legal question before the Delhi High Court.
The Commercial Stakes: Why “6E” Is Worth Litigating
Against this backdrop, IndiGo’s decision to litigate, even after Mahindra voluntarily renamed the vehicle “BE 6”, is not difficult to understand. For IndiGo, the case is not primarily about the specific vehicle. It is about the principle that “6E” belongs to a brand identity system it has built over nearly two decades, and that allowing another company to use even a close variant of the root mark creates a precedent that threatens the integrity of the entire system.
The economic logic is straightforward. A brand that builds a product architecture on an alphanumeric root, as IndiGo has done with “6E”, is exposed to dilution not just from identical use but from any use sufficiently close to generate association in the consumer’s mind. If “6e” on a Mahindra SUV is permissible, what about “6E” on a hospitality chain, an electronics brand, or a logistics company? Each new use erodes the exclusivity that makes the root mark commercially valuable. And in an era when brand value routinely exceeds asset value on corporate balance sheets, erosion of mark exclusivity is not a legal inconvenience. It is a balance sheet risk.
Mahindra’s position is equally rational. Alphanumeric combinations are finite. Numbers run from zero to nine. The alphabet has twenty-six letters. Two-character combinations from these sets number in the hundreds, not the thousands. If courts allow brand owners in one industry to monopolise short alphanumeric marks against all other industries, the combinatorial space available for product naming shrinks dramatically, and shrinks fastest for exactly the kind of clean, minimal, digital-ready identifiers that modern brands most want to use.
Between IndiGo’s legitimate interest in protecting a mark it has invested in for nineteen years, and Mahindra’s legitimate interest in naming its products in a world with a limited supply of short, distinctive marks, there is no easy accommodation. That is why mediation failed. And that is why the Delhi High Court’s eventual judgment will matter to every brand owner in India, not as a precedent about airlines or electric vehicles, but as a ruling about the limits and extent of alphanumeric mark protection in the twenty-first century commercial environment.
Section III — Factual Background: How “6E” Became a Battleground
| November 26, 2024 — Mahindra unveils the BE 6e at its electric vehicle event November 25, 2024 — The Registrar of Trademarks accepts Mahindra’s application to register “BE 6E” under Class 12 (note: the Registry acceptance actually preceded the public launch by one day — a detail worth noting) December 2024 — IndiGo files the trademark infringement suit before the Delhi High Court. The case is first listed before Justice Amit Bansal, who subsequently recuses himself December 7, 2024 — Mahindra announces that the vehicle will be marketed as “BE 6” pending resolution of the dispute. December 9, 2024 — Justice Mini Pushkarna records Mahindra’s undertaking not to use “BE 6e” during pendency; the Court disposes of the application for interim orders and adjourns to April 2025 for final hearing. IndiGo confirms it will not seek an interim injunction April 2025 — Matter listed for pleadings October 31, 2025 — Joint Registrar (Judicial) Sudhir Kumar Sirohi notes mediation has failed; both parties directed to file photocopies of relevant documents and prepare a joint schedule February 3, 2026 — Case listed for admission, denial, and marking of exhibits Parallel track — Parallel opposition proceedings concerning Mahindra’s trademark application remain pending before the Trade Marks Registry. |
The collision between IndiGo and Mahindra over two characters is a story built from two parallel acts of brand construction: one spanning nearly two decades, the other barely two years; that arrived at the same alphanumeric destination from entirely different directions. Understanding what each party actually built, and why they built it the way they did, is essential before any legal analysis can carry weight.
IndiGo’s “6E”: From Code to Identity
In 2006, when IndiGo’s parent company InterGlobe Aviation launched operations, it received the IATA designator “6E”: a two-character code assigned by the International Air Transport Association to every commercial airline for use on flight tickets, departure boards, booking systems, and operational communications worldwide. At that moment, “6E” was purely functional. It was a registry entry, not a brand.
What followed was nearly two decades of deliberate transformation. IndiGo used “6E” not merely as an operational identifier but as the centrepiece of a consumer-facing brand architecture. The mark consistently and visibly appeared on boarding passes, aircraft livery, in-flight announcements, advertising materials, and digital platforms across every passenger touchpoint. Over time, the identifier assigned to IndiGo by a global aviation body became something no assignment can manufacture: a mark that consumers associate with a specific commercial experience without being told to.
The formal registration history reflects this evolution. IndiGo obtained registration for the word mark “6E Link” in 2015 under Classes 9, 16, 35, and 39, covering advertising and promotional materials, transport-related services, illuminated signage, and printed advertising boards. The choice of these four classes is itself strategically significant: they are not the classes one would choose to protect an airline’s core operational service. They are the classes that protect the commercial infrastructure of a brand: the advertising, the signage, the printed materials through which “6E” reaches the consumer. IndiGo was not merely registering a mark. It was building a legal perimeter around the consumer-facing expression of its identity.
The brand architecture that grew from that root was systematic. The airline incorporated “6E” across multiple branded services, including 6E Prime, 6E Flex, 6E Add-ons, and 6E Rewards. Each extension deepened consumer familiarity with the root mark, training passengers to read “6E” as a prefix that signified IndiGo’s commercial ecosystem, not just a flight designation but a tier, a benefit category, a point of distinction. By the time Mahindra’s electric SUV arrived in November 2024, IndiGo’s position was that “6E” had crossed a threshold that the Trade Marks Act, 1999 recognises and protects: it had become a well-known trademark, capable of identification across categories by the Indian public.
One important technical distinction requires clarity here, because it runs through the entire legal dispute. IndiGo has never obtained registration for the bare mark “6E” alone. Its formal registered right is in “6E Link.” The claim to the bare “6E” rests on something different: on the rights acquired through nearly two decades of consistent, continuous, and high-profile use under Section 11 of the Act. The distinction between registered rights in a composite mark and unregistered rights in an element of that mark built through use is not a technicality. It is a foundational tension in the litigation, and the court will need to address it directly.
| What is Section 11? Section 11 bars a new trademark from being registered if it causes a “likelihood of confusion” among consumers. Under standard rules, different companies can use similar names if they operate in entirely different industries (e.g., Apple Computers vs. Apple Vacations). However, Sections 11(6) and 11(2) provide a powerful exception for “Well-Known Trademarks”. If a brand proves its mark is deeply recognized by the public, Section 11 protects it across all industries; even against companies selling completely unrelated products. |
Mahindra’s “BE 6e”: Born Electric and the Hidden Meaning
Mahindra’s arrival at “6e” was reached by a completely different route; one grounded in product architecture, platform strategy, and a designer’s instinct for wordplay.
In 2022, Mahindra announced its INGLO platform: a ground-up electric vehicle architecture designed exclusively for battery-electric vehicles, developed in partnership with Volkswagen Group. The INGLO platform was not a conversion of an existing petrol or diesel chassis. It was built from a blank sheet for a pure-electric future, and Mahindra wanted the naming convention for its INGLO-based vehicles to clearly communicate that distinction.
The result was a two-brand architecture. Vehicles in the “BE” sub-brand (Born Electric) would be sporty, performance-oriented SUVs. Vehicles in the “XEV” sub-brand would be premium, family-focused electric SUVs. Numbers within each sub-brand would indicate model positioning: higher numbers for larger, more premium vehicles. The “e” suffix across both ranges would signal electrification. In Mahindra’s internal logic, “BE 6e” was therefore a composite designator: platform identity (BE) + model number (6) + powertrain suffix (e). Each element had a defined role. None was chosen arbitrarily.
But Mahindra’s design chief, Pratap Bose, the former Tata Motors designer credited with transforming that company’s aesthetic identity, had layered something else into the BE 6e name. Mahindra described the BE 6e as “be sexy”: a deliberate phonetic reading of the alphanumeric sequence that aligned with the vehicle’s futuristic, coupe-like design language and its target audience of younger, aspirational urban buyers. This secondary meaning was not a private internal joke. It was communicated to the press and consumers as part of the vehicle’s launch narrative. It was an invitation to read the name as a statement of character, not merely a product code1.
This dual meaning, product architecture designator and cultural aspiration, is directly relevant to the legal proceedings in two ways. First, it speaks to intentionality. Mahindra did not land on “6e” by accident or convention. It chose the specific combination with awareness of its phonetic and cultural resonance, and marketed that resonance publicly. Second, it complicates Mahindra’s own defence that “6e” is merely a generic technical suffix. A company cannot simultaneously argue that “e” is a generic electrification suffix that no one can monopolise, and that “BE 6e” means something as specific and creative as “be sexy.” The creative intentionality behind the name undermines the genericism argument.
The Sequence of Events: A Timeline of Escalation
What followed the BE 6e’s launch moved at an unusual pace for trademark litigation, and the sequence of events contains details that each party has reasons to emphasise.
On November 25, 2024, Mahindra Electric Automobile Limited was granted acceptance for the word mark “BE 6E” in trademark Class 12 by the Registrar of Trademarks: the class that broadly encompasses motor vehicles and their components, including electric cars, buses, trucks, and utility vehicles. The Registry’s acceptance preceded the vehicle’s public unveiling by a single day. This sequencing matters: the Registry’s acceptance of Mahindra’s application is not a determination of validity, and it does not override IndiGo’s pre-existing registered rights or common law rights built through use. But it is evidence that the Registrar, at the examination stage, did not find the application prima facie objectionable on grounds of conflict with IndiGo’s marks. IndiGo will need to explain to the court why the Registrar was wrong or why the court’s own assessment of the trade mark landscape differs from the Registry’s initial view.
| The Indian Registrar of Trademarks initially allowed Mahindra’s application to proceed because the trademark authorities evaluate applications based on strict structural and classification rules, rather than subjective brand associations. The trademark registry is divided into 45 distinct classes. Trademark examiners search for conflicts primarily within the same class. • Mahindra applied for “BE 6e” under Class 12, which is strictly reserved for motor vehicles, locomotives, and automotive parts. • IndiGo’s foundational trademarks (like “6E Link”) were registered under Classes 9, 16, 35, and 39, which cover things like aviation, transport, navigation, and advertising. • Because a car is fundamentally different from a flight ticket, the initial automated screening by the registry did not flag it as an immediate conflict. The registry analyzes a trademark as a whole, not just by its individual parts. Mahindra did not apply for a standalone “6E”. They applied for “BE 6e” The registry viewed “BE” (which Mahindra already legally owned as a registered brand for its “Born Electric” platform) as the dominant visual and phonetic identifier. The “6e” suffix was seen as a subordinate model identifier, making the overall mark “BE 6e” look and sound distinct from IndiGo’s standalone “6E” airline call sign. When the trademark office “allows” or accepts an application, it does not mean final approval. The authorities deliberately publish accepted applications in the official Trademark Journal for a mandatory 4-month window. This phase acts as a public notice system. The registry relies on external companies to monitor the journal and flag issues. IndiGo spotted the advertisement during this window and immediately launched formal opposition proceedings. Why the Court Intervened Anyway The Registrar of Trademarks focuses heavily on classification. However, the Delhi High Court operates under broader intellectual property principles. IndiGo bypassed the slower registry bureaucratic process and went straight to court, arguing that “6E” is a “Well-Known Trademark”. Under Indian law, if a brand is deemed well-known, it gains cross-industry protection, allowing it to override the registry’s class system and stop other companies from using similar names in entirely unrelated fields. |
On November 26, 2024, Mahindra publicly unveiled the BE 6e at its electric vehicle event. IndiGo moved quickly. They filed its trademark infringement suit in December 2024 before the Delhi High Court, contending that the mark “6E” had acquired exclusive association with the airline through nearly two decades of continuous use since 2006. The case was first placed before Justice Amit Bansal, who subsequently recused himself without publicly stated reasons: a procedural development that added several weeks to the timeline before the matter was relisted.
The case came before Justice Mini Pushkarna. Before the court could address the question of an interim injunction, Mahindra moved to defuse the immediate commercial dispute. In court, Mahindra said it had renamed the model “BE 6” and assured the court it would not use “BE 6e” during the proceedings. On December 9, 2024, Justice Pushkarna formally recorded Mahindra’s undertaking and disposed of IndiGo’s application for interim orders, adjourning the matter to April 2025 for hearing on the merits. IndiGo maintained that the dispute nevertheless warranted legal resolution, confirming that it would not seek an interim injunction but would not let the underlying rights question go unresolved.
This is an important tactical moment. IndiGo’s decision not to press for an interim injunction (once Mahindra had voluntarily renamed the vehicle and given its undertaking) reflects a considered litigation strategy rather than a concession of weakness. The airline secured the immediate practical outcome it needed: the BE 6e name was off the market. What remained was the broader legal question, which IndiGo chose to pursue precisely because it wants a court ruling on principle, not merely a commercial accommodation.
The matter was listed for pleadings in April 2025. The parties were referred to mediation, the standard practice in commercial disputes before the Delhi High Court. Joint Registrar (Judicial) Sudhir Kumar Sirohi, noting the stalemate, directed both companies to file photocopies of relevant documents, along with a joint schedule, upon confirmation that mediation had failed on October 31, 2025. Mediation’s failure is itself informative. Commercial parties with limited stakes in principle tend to settle. Parties who litigate through mediation failure generally do so because the principle matters more than the cost, or because the litigation itself carries strategic value beyond the immediate dispute.
The case is now slated for admission, denial, and marking of exhibits, with a hearing date of February 3, 2026. As of mid-2026, the matter remains at the evidence and pleadings stage. No judgment or significant interim order from the February hearing has been publicly reported, indicating the matter continues through the standard pre-trial process. A full trial, with written submissions and oral arguments, lies ahead.
The Parallel Track: Registry Opposition
One dimension of this dispute that deserves separate attention is the proceedings running in parallel before the Trademark Registry; a track that is distinct from the High Court litigation but closely related in its legal consequences.
Opposition proceedings against Mahindra’s claim to the “6e” mark continue before the Trade Marks Registry. These proceedings operate under Section 21 of the Trade Marks Act, 1999, which allows any person to oppose the registration of a mark within four months of its advertisement in the Trade Marks Journal. IndiGo’s opposition, if filed, would be heard and decided by the Registrar: an administrative proceeding with its own evidence, hearings, and timeline, running independently of the civil suit in Delhi.
The significance of this dual-track structure is that the two proceedings can, in theory, produce divergent outcomes. The Registrar could refuse Mahindra’s Class 12 registration while the High Court simultaneously finds no infringement of IndiGo’s existing registered or unregistered rights. The Registrar could allow the registration while the High Court grants IndiGo a permanent injunction. The two forums apply overlapping but not identical legal standards. Managing both tracks, and ensuring that admissions, evidence, and arguments in one do not inadvertently damage the client’s position in the other is one of the more demanding aspects of this dispute for the legal teams on both sides.
The Commercial Stakes, Plainly Stated
Stripped of procedural history, the factual conflict reduces to this.
IndiGo has used two characters (6E) as its primary consumer-facing brand identifier for nineteen years. It has registered a composite mark, extended the root mark across multiple service sub-brands, and invested in making those two characters synonymous with its commercial identity in the minds of millions of Indian consumers. It argues that this investment has earned its rights that extend beyond the aviation sector and that any use of the same or confusingly similar alphanumeric combination by any company in any sector capable of reaching the same consumer base constitutes infringement or dilution.
Mahindra’s response is direct: “Mahindra’s mark is ‘BE 6e,’ not the standalone ‘6E.’ This differs fundamentally from IndiGo’s use of ‘6E,’ which refers to the airline. Our registration application is for an entirely different industry sector and product.” In Mahindra’s submission, “6e” is a subordinate element of a composite mark built on a pre-existing platform architecture, registered in a class with no overlap with aviation services, and used in a commercial context in which no consumer could reasonably confuse a car with an airline.
Between those two positions, one asserting the breadth of earned cross-sector rights, the other insisting on the specificity of sectoral registration, lies the legal question the Delhi High Court will decide. The factual record, as set out above, is largely agreed. What is contested is what the law does with it.
Click here for Part II, where we unpack the legal battle over who really owns “6E”.
