I was wondering about this too. If anyone could shed more light on this it would be great! I can't count the number of times that I have only had a few hours to grab a bag, get to the airport and take a flight. If I needed to book up a minimum of 72 hours prior, it would put a huge damper on my ability to do so.
Originally Posted by
FriendlySkies
I believe that the OP was talking about General Aviation flights. If so,

What about emergency flight plans?