The incredibly long queues and the security checks. Sure, the latter makes sure i don't crash into the ocean at 500 km/h due to a terrorist bomb, but it takes a while, and it sure as heck isn't easy when the security people speak a language that one doesn't understand. >.> (At least they switched over to english after i looked like a giant question mark)
Flying's kinda fun though, looks cool to see the clouds from above.