This has me wondering - the arteries in my mom's legs are made of man-made material. Kind of like the dryer-vent tubing. If she sits for a long time the tubes can kink and cut off circulation. They don't spring back into place easily either. She has to sit in a chair with her hips up to keep her legs as straight as possible or lie down. She has a bunch of other ailments - she is definitely medically disabled. She has given up flying because she can't stretch her legs out and can't afford first/business class. Are there considerations for people like this so she could fly? I know she would love to go home to Ireland but can't make the trip otherwise.