Why you shouldn't be afraid of flying, according to a flight expert

There are many statistics out there that prove that flying on a commercial airplane is safe, that plane crashes are overall pretty unlikely. Still, up to an estimated 40% of Americans feel some fear at the thought of flying. So, amid the travel rush of the holiday season, we ask MIT aeronautical engineer Mark Drela: How does a plane lift off and stay up in the air? Interested in more stories on physics? Email us at shortwave@npr.org. We'd love to hear from you!Listen to every episode of...