I had a full node clearance(17 nodes)back in 2003.My arm used to ache alot at first but settled down after a few years.I try to remember to do a gentle massage every other day that the physio showed me. I made sure I moved around the plane and I didn't lie on the "bad"side for a long period.I had a sleeve with me just incase.But I find the hot flushes make it too difficult to wear-just want to rip it off,along with my clothes! I've had a fair few flights since 2003 and never had any arm problems.But we are all different and you just need to do what feels right for you.
Tonya xx