United Airlines Bans AI Agents as Amazon, Target, eBay Block Bots

United Airlines announced Wednesday that it's banning third-party AI agents from searching, booking, buying, or managing trips on its platforms — the latest in a wave of restrictions now spanning Amazon, eBay, Target, Booking.com, Resy, and Yelp.

The airline cited security and regulatory risks, plus the possibility of unintended purchases. Its sharpest example: an agent checking in on a flyer's behalf could violate federal regulations requiring a human to confirm their bags contain no banned items like explosives.

The crackdown follows a surge in agent adoption since Meta launched its Muse assistant in September, alongside rivals like Instinct. ChatGPT and Claude have both added agentic capabilities too. Companies banning the bots cite privacy and security concerns — and, unofficially, worry that agents could drain site traffic if humans stop visiting directly to browse, buy, or book.

What does each company's policy actually say?

The restrictions vary widely in scope and tone:

• Amazon — In September, GeekWire reported Muse users shopping Amazon saw a popup: "continued access by an unauthorized AI agent violates Amazon's Conditions of Use, to which our customers have agreed." Amazon's terms don't ban all agents outright, but state the company "may limit, including by technical measures, whether and how any Agent accesses, uses, and interacts with Amazon Services."
• eBay — Updated its user agreement to prohibit unauthorized automated access, specifically naming "buy-for-me agents," "LLM-driven bots," and "end-to-end flow that attempts to place orders without human review."
• Target — Prohibits AI shopping agents unless explicitly authorized. Its approved list covers "Target's AI Shopping Assistant, OAI, Google and Microsoft." Approved agents can sign in, build carts, place orders, and initiate returns with customer permission — and Target can change the list or cut access at any time.
• Booking.com — Bars automated assistants from making bookings or accessing the platform without prior permission, and says it will block anyone it suspects of using AI assistants.
• Resy — Takes a whitelist approach: ChatGPT and Claude are supported for discovery and booking, but other AI activity can be blocked. The restaurant platform cited security and excessive demand on its system, and said rule-breakers could lose their accounts.
• Yelp — Allows no non-human traffic without express permission, but runs a paid data-licensing program enabling approved integrations — including one that lets ChatGPT users make reservations.
• United Airlines — The newest ban, blocking unauthorized agents entirely from trip search, booking, and management.

What does this change for marketers?

For anyone building commerce or travel experiences around agents, the message is that access is now negotiated, not assumed. Whitelists, licensing deals, and technical blocks are becoming the standard interface between AI companies and the platforms holding the inventory.

Note the split in strategy. Walmart is reportedly adding AI-agent shopping features while Amazon blocks bots — two retail giants reading the same trend and choosing opposite plays. The publishers of Muse, Instinct, ChatGPT, and Claude now face a patchwork where a booking flow works on one platform and hits a wall on the next.

For brands sitting on valuable data and transaction volume, this is also leverage. Yelp's paid licensing model shows one monetization path: charge agents for structured access rather than fight them in court or in robots.txt.

Expect the list to keep growing, and expect the approved-agent lists — Target's, Resy's — to become the real battleground where platforms decide which assistants get to transact and on what terms.