The Reunion Blues double will fit in the overheads. I fly allot internationally (Esp. US to Canada) and travel with a RB flugel soft case and Bam single tpt case. The only problems I have had is from Toronto to Albany. The plane was so small there was no over heads at all. So they put the Bam case in the crew locker and everybody was happy. Flugel went under the seat. If you give them attitude about it they can (and will) refuse to let your horn on. Then it must be gate checked. I have seen this happen on both American and Canadian Airlines. The letter from the Union will not help. It is %100 the flight Attendants call. So be good to them. Also: Put your Valve oil and slide grease in your checked bags. I had to throw out a bottle of Oil (because it was petrol based) in Chicago, Il. three weeks ago.