I sit in a chair for hours at a time for my day job without any problems. I think there is just something about having no choice but to sit there for hours on end in a plane that makes my legs go crazy. The rest of my body is fine but my legs get claustrophobia. And then of course when the plane lands and I get up I always manage to bang my head on the overhead luggage compartment. Always.
Also, tomorrow I will be on a plane headed out for Webcomics Weekend! I hope to see some of you there! I hope the plane has good legroom!