The risk of veval thrombosis and pulmonary embolia during aviation is rather smalt. The risk markedly rises during long flights (over 7500 km) and namely in elderly persons. Danger of the disease can be lowered by lower limbs exercising, liberal intake of soft drinks, and by elastic calf bandages. Persons of the high risk are candidates for low-molecular heparin administration.

        Key words: thrombosis of deep veins, pulmonary thrombosis, low-molecular heparin, travel by air