>the original sale to a competitor that does allow agents.

Competitor's margins also rely on the upsells and ads. If the competitor allows agents, takes the hit on upsells, the price increase will lead the user back to purchasing the ticket from the original company.

Obviously many possible ways it can go, so we don't know.

> it might not be terribly hard to talk Claude into accepting upsells

Eh, I'd give it a standing instruction to upgrade my cabin if the price makes sense.