Some people love to fly, some are afraid of it, and some simply suffers from motion sickness, so it is different how you feel during a flight. To fly does actually entail a slight increase in the risk of developing blood clots, and everyone could benefit from listening to the simple advice of using support stockings during flights lasting more than a couple of hours, as that is by far more healthy. The problem with flying is that it is difficult to move around and get the venous pumps going which normally comes from movement, but on an airplane the space is limited, and due to the very dry air on the flight most people also becomes slightly dehydrated during a flight e.g. across the Atlantic. My advice to your flight is clear: Buy a pair of great support stockings which you like to wear and use them when you are flying and drink plenty of water.