Originally Posted by
Azulcactus
Once you board your original flight, the system should be smart enough to cancel your backup flight immediately so it no longer is a sold seat and therefore is released. That was my point. Now whether the systems are in fact smart enough or not is a whole different story entirely.
It would have to be after the original flight actually took off, no? Boarding wouldn't be enough, I'd think, especially in the case of possible mechanical or weather problems.