To be clear, unlike many people it seems, I don't disagree with the principle of differentiated pricing, because I value the upside - cheap marginal seats. And

To be clear, unlike many people it seems, I don't disagree with the principle of differentiated pricing, because I value the upside - cheap marginal seats. And indeed I'm not disputing that tickets are contracts. I do think that it's reasonable for people to assume, up until now, that tickets are options - that if you no longer agree with the terms before you've exercised it, you can just discard the ticket. That's the only real point I wanted to make, because you made it sound as if it's obvious that tickets may reasonably come with positive obligations to exercise, and I didn't think it was obvious to non-lawyers. I found it interesting that https://en.wikipedia.org/wiki/Ticket_cases https://en.wikipedia.org/wiki/Ticket_cases talks about retaining the ticket being a condition for being bound by the contract, that using the ticket is equivalent to signing the document, and whether a reasonable person would have known about the terms. Sounds like there could be some edge cases in there, but I don't have the education to be enlightening.