I've never had a problem whether or not I got the guitar of the day onto the plane or it ended up in the cargo bin.
My '93 Martin D-41 will be making a return trip with me to London to play at The Ruskin House Folk & Blues Club in April. Not expecting any problems either way.
Even though it's original Martin case has done the job in the past, I bought a Hiscox Pro II case for upcoming trips for a little added protection without increasing weight.
Heading back to London:
To do:
* Tune down about 2 steps.
* Remove ALL articles from the case. And don't forget to remove the battery if you have an active pickup!!!
* Pack soft cloth around the headstock area and ensure the body is snug.
* Take a pic the day you leave with a copy of that day's newspaper in the photo.
* Insure your guitar for full replacement value.
* RELAX!
Bill