United Airlines has rewritten its contract of carriage to bar personal AI agents from booking, changing or servicing its tickets, on its own website and app and through travel agencies and aggregators. The change landed on November 11, and it makes United the first major US airline to draw this line in its ticket rules.
Assistants can still surface United flights and fares for a traveller to look at. They just can’t complete the purchase, touch the reservation afterwards, or buy extras on anyone’s behalf.
The contract of carriage now names AI agents directly
The revised terms define an AI agent broadly, covering software that takes autonomous or semi-autonomous action even when a passenger supervises or approves each step. Assistants built into social media, messaging and search platforms fall inside the definition, and so do AI-enabled browsers and standalone agents.
The prohibited list is blunt: using an AI agent to make, modify or service a ticket, or to purchase any service or product, breaks the contract. Reservations made, modified or serviced by an agent join the list of bookings United may cancel.
Bookings an agent completed before November 11 stand, and United says travellers should check recent trips were ticketed correctly.
One date splits the old trips from the new rules.
Security and federal check-in rules carry the reasoning
United’s warning starts with credentials. Handing an assistant a payment card or an account login can expose sensitive information, and the airline lists the failure modes plainly: unintended purchases, account changes, or use of MileagePlus miles that the account holder never meant to spend.
Federal rules add a second layer. Check-in asks a passenger to acknowledge that a bag holds no prohibited items such as explosives, and United argues an automated agent ticking that box could put the airline on the wrong side of Department of Transportation and Federal Aviation Administration requirements.
A human acknowledgement is a legal act, and the airline wants a human performing it.
Other airlines are choosing the opposite door
United is early, and it knows the contrast. Southwest recently built a plugin that lets travellers book its flights through ChatGPT, a discovery-to-booking path built with the airline’s blessing, while Delta and American say they’re still evaluating how AI tools should interact with their bookings.
Chief executive Scott Kirby has been open about the reluctance behind the move, saying he doesn’t want to create another middleman between the airline and its customers. United adds that it works with no third-party AI agents today, and that any future integrations need standardised, secure technology with privacy and accountability built in first.
The demand side is still tiny. Uber told investors its platforms handled 320 million trips and deliveries during Halloween week, and AI agents accounted for 500 food orders and four rides in that flood.
Four rides.
So the ban lands before agent booking becomes normal behaviour, which is exactly when a contract change is cheapest to make. Travellers lose nothing they were widely using, United keeps its booking data and its customer relationship in house, and every other carrier now has to decide whether to copy the clause or court the agents United just shut out.