Shipping a guitar, gound or air?
Overnight is overnight and overnight isn't cheap. In the case of a UV unless it's an expensive MC what's the point? The weather isn't going to affect it and if it's in a UV1000c the damge that could be inflicted is pretty minor. Ground. UPS will run you $25, overnight $85, 2nd day $65. USPS a hair cheaper as long as the insurance isn't high (the great equalizer)
I generally feel (no matter what Kev says) is that UPS is the way to go. I get plenty of guitars shipped in Postal and my "letter carrier" is none too pleased he's lugging these things around!! You have to believe that "distain" carries across the board as the counter folks don't like recieving them either! They know it's their *job*, but doesn't make them happy campers.
The UPS guys are just happy they can lift the package easy!!! They are used to and *expected* to haul the nations larger shipments and do it gladly and willingly. I believe this makes a big difference in the way your package gets *handled*.
Bottom line, any carrier can damage a package.