UPS and FEDEX send 'all' their stuff by air (even if it's going to the same town, it is shipped to their hub and back) and it goes through baggage handling/sorting equipment similar to regular airlines.

You will still need the "Throw it down the stairs test'.

The easiest way of course is to keep a cheap guitar for when you travel. You can pick up a new Yamaha for around $175 that will be surprisingly good; or pay about half that at a pawn shop. Just paint "Martin" over the logo and no one will know the difference.

The only problem that you will then have, is that you will be certain to develop a sentimental attachment to the cheap old thing, and after a few journeys you will be back in the same situation.

If it's a place that you will be going to quite often, then you could always just leave one of your guitars there.

Bert.