Marcus a few posts above hit it square on the head. I fly extensivly for work as well.... plan on taking it as a gate check. You may be able to carry it on, but pack it as planning and expecting to do a gate check. You wont pay baggage fees and you carry it yourself up to the jetway. At that point it depends on the size of the plane and airline policy....With a gate check you avoid the baggage handling conveyors and they give you your instrument back at the next gate, not the baggage carousel (United Airlines is an exception here - I avoid United for this and other reasons). Nonetheless, pack your instrument in a good case....