I have just flown to the US and back in 1 week. I flew Brisbane - LA - New York - Boston - LA - Fiji - Brisbane. The Fiji component was only in there because the plane didn't have enough fuel "if something happened in the landing in Brisbane". (!!!) Over 45hrs of flying.
I wore my Circulation Booster MOBILE the entire time. US security never questioned it. My feet felt brilliant. My legs never felt tire or achy. It was great! And also, no DVT!
If you are flying or know someone who is, suggest they get a Circulation Booster MOBILE. Apart from making the flight more comfortable, I didn't have to worry about Deep Vein Thrombosis!
Enjoy.