Just in (to Hawaii) from the East Coast. In the past few years, my left knee has become excruciating on long flights from fluid accumulating due to a combination of long periods of sitting erect and (perhaps) lower air pressure. Yesterday, I wrapped my knee in an ace bandage (not tightly, just enough to press in slightly) moments before getting on the plane in Boston. Worked like a million bucks -- hardly a twinge of pain the whole flight. (I know, off-topic, but perhaps one day someone will Google this article and save themselves some pain.)