AIR TRAVEL AND DVT In 1954 Homane first reported an association between air travel and venous thromboembolism, recently the supposed risk of dvt and subsequent pulmonaryemboli associated with air travel (the so-called economy-class syndrome) has been the subject of muchpuplic scrutiny,factors such as dehydration.immobilization.decreased oxygen tension.and prolonged pressure on the popliteal veins resulting from long period in confined aircraft seats have to  been suggested to be contributory factors .while the evidence linking air travel to an increased risk of dvt is still largery circumstantial , the folloowing facts may help answer and questions from your patients, family and friends ?