For some reason if I get much of a cut or infected cut or anything on that hand or arm, I will get some lymphedema and need to wear my sleeve. I would try for a slightly shorter flight (I always take my sleeve) and see how it goes. My flight from Oregon to Baltimore are roughly 9 hours, with at least one flight change.
How long are the international flights you take? Have you asked your doctor? I never even thought about it until a friend said take your sleeve before my first meeting.