S&S coupled bike in a hard case, had a few issues.
Multiple times TSA opened the box and sat on it to re-close it. Results: wheels out of true, bulges in the case where the axles tried to poke through, some scratches where they didn't put the frame padding back in place.
Related to above: kinked a shift cable and cracked a cable connector. (They couldn't be bothered to put the cables back in the case!?!) Missed that when I got home, had to do an emergency cable replacement before the next ride.
Bashed the case hard enough to shatter plastic ring inside a bar-end shifter.