To prevent Deep Vein Thrombosis (DVT) in 2026, the "gold standard" advice is a combination of movement, hydration, and compression. You should perform "ankle pumps" (flexing your feet up and down) and "knee-to-chest" stretches every hour from your seat. If the "fasten seatbelt" sign is off, a five-minute walk to the galley and back is highly recommended. Wearing graduated compression socks (15–20 mmHg) is clinically proven to reduce the risk of blood pooling. Staying hydrated by drinking at least 8 oz of water per hour is vital, as dehydration thickens the blood; conversely, you should limit alcohol and caffeine, which contribute to dehydration. For 2026 travelers at high risk (e.g., recent surgery or smokers), doctors may prescribe a low-dose anticoagulant (like baby aspirin or a specific blood thinner) to be taken just before the flight.