United has quietly rewritten its contract of carriage to prohibit passengers from using AI agents to search, book, change or service flights. The change, announced with an actual press release, covers flights, seats, upgrades, extra products and even partner airline redemptions booked on your behalf by an AI tool — whether or not a human approves each action.
The definition United uses is remarkably wide. It covers AI assistants built into messaging or social apps, AI-powered browsers, standalone agents, and any third-party AI tool that reaches United through a travel agency or aggregator. If software takes autonomous or semi-autonomous action to find or manage a United product, it's in scope.
The airline's stated reasoning is customer safety: sharing account logins with personal AI assistants can expose sensitive data, bots could trigger accidental purchases or burn MileagePlus miles without your real consent, and automated check-in could fall foul of FAA and DOT rules — you're supposed to personally confirm your bags contain nothing dangerous. United says it will block these tools both on its own platforms and indirectly via agencies and aggregators.
Sceptics — including the analyst who flagged the change — see a second motive. An AI agent that can continuously monitor and reprice a fare, rebook when prices drop, or compare total value across carriers is bad news for airline revenue. There's also the data question: airlines would rather not hand a third-party platform a complete picture of their pricing, and mass bot traffic strains servers.
The really awkward part is the wording. If any software that automatically "discovers" or searches United products counts as a banned AI agent, then award search engines and plenty of legitimate tools arguably fall under the ban too. It's unclear whether United intends to enforce it that broadly, or will pick its battles. Air Canada went down a similar road with chatbot-related disputes a few years ago, so there's precedent for airlines fighting this corner.
For travellers, the practical takeaway is simple: book and manage United trips yourself, or through a human agent. Don't hand your MileagePlus credentials to an AI browser extension that promises to hunt down cheaper fares — you could void a booking or worse. Whether this is genuine consumer protection or a competitive moat, it's a sign of where airline booking rules are heading as AI agents go mainstream.
For now, United is the first major US carrier to write this into its terms, so if you're a fan of letting an AI do your fare-hunting, you'll need to point it at another airline — or do the searching yourself.
