Whether you’re on a short domestic flight or jet-setting across the world, your skin suffers a lot at 30,000 feet in the air. The biggest concern: dehydration. Did you know, your skin can lose up to a half liter of water in a 7-hour flight? Here's why: As air in the cabin gets continuously circulated throughout the flight, it loses moisture through evaporation. When the air is drier than your skin, it draws moisture out of your skin, which makes it dry, dull, and flaky. Keep hydrated and glowing from take off to touchdown with these smart tips and in-flight must-haves.