I fly a lot (100k miles a year) but never with my own pups. Please dont take my response the wrong way. It is rare that i encounter pups who are naturally good flyers. The pups who have taken some meds seem to do better and their parents seem to be happier as well. As bad as a scared or motion sick pup can be on the flight - you will feel just as bad trying to take care of him and not disrupt the other 300 passengers on the flight. 14 hours is a long flight - and it is easier taken if everyone is happy with their seat mates.
Karen