LOLtraveling overseas? why not ride there?
Won't he have to adjust the carb for lower air pressure as the cabin does not stay at sea level. Of course taking oxygen and mixing it with cabin air to get sea level by microprocessor control might be done too.Disguise it as a wheelchair. You'll be first on, first off. Just don't start the engine during take offs and landings. The ignition messes up the plane's avionics just like cell phones, laptops and wireless speedometers.
Tom
I was going to suggest a snorkelLOL
Can't roll up the windows so have to hold yer breath.