1 bike stolen after checked with a now defunct airline. My boxed bike was never found. I borrowed a bike from the friend whose home I was intending to ride to at the beginning of the tour.
1 wheel pretzeled. Bike was in a plastic bag supplied by the airline. Fortunately, it happened at the end of the tour. I built a new wheel after I got home.
1 downtube bashed and indented, looking as though it had been done intentionally with a hammer. Hasn't affected rideability, fortunately. Bike was unboxed.
Since I bought my Bike Friday, a folder which packs into a hard-sided suitcase, I have had no problems and paid no bike fees.