Final answer:
Ahaya, who has heart failure, is at a higher risk of developing DVT due to impaired heart function and decreased skeletal muscle movement. Sitting still for long periods during a flight can cause blood to pool in the deep veins of the legs, leading to blood clot formation.
Step-by-step explanation:
Ahaya, who has heart failure, is at a higher risk of developing deep vein thrombosis (DVT) because the pumping action of the heart is impaired, making blood clots form more easily. Sitting still for long periods of time on a plane can cause blood to pool in the deep veins of the legs, leading to the formation of a blood clot. In the case of Ahaya, flight increases his risk of DVT due to prolonged sitting and decreased movement of the skeletal muscles, which play a crucial role in pushing blood through the veins.