The risks of travel and long periods sitting.
Dave and I just got done with a six week journey across America. We visited many National Parks. We needed to end our trip one week early because Dave had some symptoms that worried us. We got home in time for them to find a blood clot in Dave's leg. Doctor says you must not sit in same position for too long, whether driving or flying or sitting. People move your legs, flex and point toes, stop often and get out and walk.
Most people get no symptons of blood clot until it is too late. Keep on traveling and keep those legs moving.