This is mostly hypothetical but I was wondering what the safest way to travel with a 3/4 size upright acoustic bass from Minnesota to New York? And what considerations are there
A hard case is essential. If it is impractical to buy a seat for the instrument, the best way to ensure its survival is to take it to a Fedex company-owned facility, not a franchise, and have them pack the interior of the case. I have had to ship an irreplaceable instrument, and chose them to do the packing. It is worth the expense. De-tune the instrument by turning the pegs back a half-turn. Also, make sure the airline knows that the instrument must be stored in a pressurized, climate controlled part of the baggage compartment. The low pressure and sub-zero temperatures in regular baggage can wreak havoc on the wood panels, veneers, neck, and frame components of the instrument.
Please post follow up on your experience.