The bigger the airplane, the more adjustable the seats/rudder pedals. I hate flying C-182's because I can't reach anything (I'm 5'4"), but the B-767 is no problem...I don't even have the seat or rudder pedals all the way up. If you want to reach something in the cockpit bad enough, you will. Lots of pilots carry seat cushion/lumbar supports with them, so that shouldn't be a problem.