HNT, don't worry about the flight. The dangerous part is driving to the airport and away from the departure point. If you suffer from motion sickness get you MD to write you a prescription for a Transderm patch. Height has alway bothered me but I have flown around in helicopters with no doors at over 1,000 ft. with no worries. I would recommend you sitting where you can look out the windows, the USA is too beautiful not to look at it from above. Besides you can lean your head against the cabin wall and nap. I have been lead to believe you are not exactly petite. So an aisle seat would be a better choice, an exit row will give you a few extra inches of knee room.