Today on science friday on NPR they were discussing lift as it relates to airplanes. The speaker said that Bernoullies principle doesn't completely account for the lift that the air flow over an airplane wing generates. He said that according to Bernoullies principle a commercial jet would have to achieve 400knots to generate enough lift for takeoff. He said that this idea is a point of contention among scientists but the lift generated is as simple as air flow over the top of the wing being enough to push downward towards the earth. He cited examples such as a helicopter and the fact that fighter jets mount missles under their wings because the air flow there isn't that important. Anyone out there familiar with this "controversy"?