Interesting that there is no discussion of COVID in a test of whether such a long period of extension is reasonable or not to satisfy the passenger’s convenience requirement.

Instinctively I’d have thought that whilst in the current circumstances it might be reasonable to argue that ‘at the passenger’s convenience’ meant a year later, the regulation is generally intended to ensure that people get to their destinations at roughly the time they travelled.

Should the requirement be entirely unrestricted? Is it reasonable to request a re-routing ten years hence? I suspect reasonableness in these cases is probably practically bound by whatever schedule the airline is selling tickets for at the time.