well, I think I'd be annoyed if the doctor isn't helping you make the determination of when it is safe to fly after this event given you aren't in your home city! Any other means of transport? Car, bus, train or boat? I'd look into that. That he has not released you yet means he's not comfortable doing so. The change in air pressure after an injury like you have can lead to a seizure, no thanks, right? Has it only been two weeks? I do think those with head injuries need to take special precautions but not indefinitely. Does he totally evade the question as to when you'll be okay for air travel? And again, I'd look into other means of transportation.