Called the airline and they still weren't very clear, but from what I understand a violin is acceptable as carryon. The did remind me it would count towards her carryon limit. My only concern is that if it's a really full flight, there might not be room for it in an overhead compartment. It's not very heavy, but it is an unusual shape. My folks will be taking us to the airport, so if it turns out to be a problem at checkin my parents will mail it to us later. She's been without it since November, though, and she's desparate to have it with her.