Best to call the airline for real restrictions, they vary according to aircraft, and on some, anything longer than a certain length is not going, I think it's the A320 that has a very tight restriction, on the check in counter there is two little fins sticking up, if your rod tube doesn't fit through them, it's staying home, no exceptions, trust me on how I know this........you can guess and hope, but, talking to the airline is your only real method.