I've got a guy who takes lessons at the store i work at who is a pilot. The only time he can practice is at hotels around the country, thus his guitar goes where he goes. Problem is the guitar is the baggage section of the plane. Obviously the change in temperature is bad but what about air pressure. Should he consider a humidifier? What precautions should he take? The guitar is stored in a hardshell, it is a entry level laminate top, back, and sides guitar. Customer asked me what his best bet is and i'm not really sure.