Went in to get my basses set up with my endorsers at Carvin Guitars after my trip to Florida. The action on my bass was off and it was floppy, everything felt different after my flight. Advice: Do not loosen the strings on your bass before a flight. Truss rods will take care of the bass during pressure change on a good quality instrument.
Setting up a bass / Adjusting the Truss Rod at Carvin Guitars