How do you buy an airplane ticket that can be used anytime?
Airplane tickets that can be used anytime and refunded if not
used are called "unrestricted" or "full-fare" or "full 'Y' fare
tickets." You can purchase unrestricted tickets on-line, through a
travel agent, or through the airline's reservations department, but
be advised, they cost significantly more money. Also, you must
still have a reservation for a particular flight, and if that
flight is full, you won't get on regardless of what type of ticket
you have. Good luck.