There are numerous examples of where a carrier’s failure to issue a ticket even on other carriers due to their internal incompetence does not get them out of EU261. MCOL and CEDR have been clear on this. As long as it is reasonable that the customer can have expected a ticket to be issued. Reasonable does not include being sufficiently savvy to have looked for a ticket number. But just to have received a changed booking.

of course, as I suggested, asking in the excellent BA EU261 thread would provide a more substantive response.

of course if it was Amex, as per the example, or any other TA that dropped the ball rather than an airline, I would be looking for substantially more including consequential damages. Airlines do not pay consequential under EU261. Small claims would be an appropriate channel if not Amexes internal processes that would have for example provided a full refund as I have received in the past.Simple charge back.

KF