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United Airlines said on 11 November 2026 that it is blocking personal AI agents from booking, changing or managing its flights. The rule is written into the airline's contract of carriage, which was revised the same day, and it covers bookings made through travel agencies and aggregators as well as United's own website and app.
The airline gives security and aviation rules as its reasons. Its chief executive has also said plainly that he does not want another middleman between United and its customers.
What exactly has United banned?
In a statement headed "United Restricts Access for Third-Party AI Agents", dated 11 November 2026, the airline said it is "taking steps to restrict access" both "directly within our digital platforms and indirectly via travel agencies and aggregators". The aim, it said, is to prohibit use by "unauthorized, third-party personal AI agents or assistants".
United said the work includes updates to its booking, ticketing and distribution policies.
The detail sits in United's contract of carriage, the legal terms attached to every ticket. The version on united.com is marked as revised on 11 November 2026 and now contains three relevant changes:
- A definition. An "AI Agent" is any software or service, including an AI assistant, AI agent or AI-enabled browser, that takes autonomous or semi-autonomous action to search for, book, purchase, ticket, service or manage a United product on a passenger's behalf.
- A prohibited practice. Under Rule 6 (Tickets), the list of prohibited practices now includes the use of AI Agents to make, modify or service a ticket, or to purchase any service or product.
- A cancellation right. Under Rule 5 (Cancellation of Reservations), the reservations United may cancel now include those "made, modified or serviced by AI Agents".
Does it matter if you approve each step yourself?
No, according to the wording. The definition applies "whether or not Passenger or another individual supervises or approves its actions".
The contract also spells out what counts. It lists AI assistants built into social media, messaging, search or other consumer platforms, AI-enabled browsers and standalone agents, and any third-party assistant that reaches United through a tool or connection provided by a travel agency or other intermediary.
One point is worth noting. The definition includes software that acts to "discover" or "search for" United products, but the prohibited practice itself is narrower: it covers making, modifying or servicing a ticket and purchasing products. Thrifty Traveler reported that AI assistants can still search United flights and fares but cannot complete purchases.
Why does United say it is doing this?
United's statement gives two stated reasons.
The first is account security. Sharing account credentials with personal third-party AI assistants "can expose sensitive information", the airline said, and actions taken by these tools "may result in unintended purchases, account changes, or use of MileagePlus miles".
The second is regulation. United said automated AI actions "have the potential to violate FAA and DOT regulations", and gave the example that flight check-in "requires human acknowledgment that bags do not contain banned substances like explosives".
United also said that corporate leaders in banking and retail "have taken similar actions regarding AI agents". It did not name them.
Is there a commercial motive too?
United's chief executive, Scott Kirby, has pointed to one. "To be honest, I don't want to create another middleman," he told The Wall Street Journal on Tuesday 10 November, according to Yahoo Finance.
Henry Harteveldt, an analyst at Atmosphere Research Group, told CBS News that the policy suggests United wants to keep control of the booking process. He also said flight searches cost airlines money, and that United probably wants to avoid the expense of a surge in searches by AI bots.
Which AI tools are affected?
United's statement and contract do not name any product. The contract defines AI agents by what they do, not by who makes them.
Press reports have supplied examples. CBS News mentioned Meta's Muse and OpenAI's dots as tools consumers use to research and buy things. Thrifty Traveler named xAI's Grok Bot and Meta's Muse. These are the outlets' examples, not a list published by United.
We found no public response to United's decision from OpenAI, Meta, Google or xAI in the coverage we reviewed.
For background on how these tools work, see our explainer on what agentic AI is.
When does the ban take effect, and how will it be enforced?
The contract of carriage carries a revision date of 11 November 2026, the day of the announcement. United's statement does not give a separate start date for technical blocking, and it does not say how the airline will detect an agent.
United said it will update its Digital Trust Center so customers can understand what the restrictions mean, how to protect their accounts and where to get help "if an agent takes an unintended action". It added that it will keep evaluating how personal AI assistants interact with its services as they evolve.
The contract already sets out what United can do when a ticket breaks its rules. The remedies listed include invalidating the ticket and cancelling any remaining part of the itinerary.
How are other airlines and travel sites treating AI agents?
The picture is mixed, and most of it comes from press reports, not airline policy documents.
| Company | Reported position | Source |
|---|---|---|
| United | Prohibits AI agents from making, changing or servicing tickets | United contract of carriage |
| Southwest | Launched a ChatGPT plugin in October for searching its flights and fares | Yahoo Finance |
| Delta | Chief executive Ed Bastian has said he is "cautious" about AI agents in booking | Skift |
| Amazon | Blocked Meta's Muse agent from shopping on its site in September | Yahoo Finance |
Skift reported that United is the first US carrier to say explicitly that it will restrict third-party AI agents. AeroTime described the move as an industry first.
United fares will remain bookable through aggregators such as Kayak, Hopper and Google Flights, Harteveldt told CBS News. The restriction is aimed at the agent doing the booking, not at the sites that list fares.
Chat assistants are also becoming shop fronts in their own right, a trend we covered in our report on businesses inside ChatGPT.
What does it mean for UK travellers?
This section is our analysis.
The rule sits in United's contract of carriage, which sets the terms of a United ticket. On our reading, a traveller in the UK who lets an AI assistant book or change a United flight is caught by the same wording as a traveller in the US, including when the assistant works through an online travel agency.
The practical advice follows from the text:
- Use AI tools to research routes and compare prices if you find them helpful, then complete the booking yourself.
- Do not give an AI assistant your MileagePlus login. United names credential sharing as the main security risk.
- If an assistant has handled a United booking for you, check the reservation in your United account.
United has not said what it will do about bookings that agents made before the change. We could not confirm any policy on that from United's own pages, so travellers with such bookings should ask the airline.
Will more websites block AI agents?
This section is also analysis.
United's decision is one case of a wider argument about who controls the point of sale. An agent that shops on a customer's behalf sits between the business and the buyer, and that is the position airlines have fought over with online travel agencies and search sites for years. Kirby's "middleman" remark makes that concern explicit.
The security argument is not empty. Handing a password to software that can spend money and loyalty points is a real risk, and United's check-in example shows that some steps are designed to need a human answer.
There is also a question of scale. Engadget, citing TechCrunch's report of Uber's third-quarter earnings call, noted that Uber handled 320 million trips and deliveries in the week of Halloween, of which AI agents accounted for 500 Uber Eats orders and four rides. Thrifty Traveler reported that United says it is not currently seeing many AI-agent bookings either.
So United is setting a rule early, before the behaviour is common. The announcement drew wide attention among developers, reaching the front page of Hacker News with more than 500 points. Commenters there questioned how a contract term can be enforced against agents that drive an ordinary web browser.
That is the open question. A clause in a contract is not a technical block, and United has not yet explained how it will tell an agent from a person.
Sources
- United Airlines: United Restricts Access for Third-Party AI Agents (11 November 2026)
- United Airlines: Contract of carriage (revised 11 November 2026)
- CBS News: United Airlines bans AI agents from booking flights on behalf of travelers
- Skift: United Airlines to Block Third-Party AI Agents
- Yahoo Finance: Bots don't fly here: United Airlines restricts AI agents from booking flights
- Engadget: United is restricting AI agents from booking flights
- Thrifty Traveler: United Blocks Personal AI Agents from Booking Flights, Will Other Airlines Follow?
- AeroTime: United Airlines to block AI agents from digital platforms
- Hacker News discussion
FAQ
Frequently asked questions
Yes. United announced the restriction on 11 November 2026, and its contract of carriage, revised the same day, lists the use of AI agents to make, modify or service a ticket, or to purchase any service or product, as a prohibited practice.
Reports say yes. Thrifty Traveler reported that AI assistants can still search United flights and fares but cannot complete purchases, and the prohibited practice in United's contract covers making, modifying or servicing tickets and buying products. The safest approach is to do the booking yourself.
United's contract of carriage gives it the right to cancel reservations made, modified or serviced by AI agents. Its listed remedies for tickets that break its rules include invalidating the ticket and cancelling the rest of the itinerary. United has not said how it will detect agent bookings.
It can. United's definition of an AI agent includes any third-party AI assistant that reaches United through a tool, application or connection provided by a travel agency or other intermediary. Booking a United fare yourself on an aggregator is not affected, according to an analyst quoted by CBS News.
Not that we could confirm. Skift reported that United is the first US carrier to say explicitly that it will restrict third-party AI agents. Southwest launched a ChatGPT plugin in October for searching its flights and fares, according to Yahoo Finance.
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