Ooops! Being a pilot who flies IFR I thought the thread had something to flight regulations.

Come to think of it, the FAA WOULD be the final source for this info. I'd check their website and also individual airline sites. I always check and then re-check. Be prepared to hold up the safety inspection line though as I've heard from a friend that instruments and cases are thoroughly checked. Wire trimmers for replacing strings are definately a no-no I was told.

Another friend of mine travels overseas for business. He knows where he will be staying, so he ships his luggage ahead of him to avoid all hassles.