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Planes are able to rise to a certain altitude and maintain it by utilizing a combination of the Bernoulli effect and the simple momentum transfer in the airflow to generate airlift. When the internal pressure reduces with respect to the increased stream velocity in a fluid, the phenomenon is known as the Bernoulli Effect. In most cases, the pressure in a fluid decreases as the fluid moves faster. This effect explains in part how wings help to lift an airplane. The cross-section of the wing is designed in a particular way so that the distance from the leading edge and the trailing edge is greater along a path that runs over the wing than under it. This is how the Bernoulli effect generates lift.
from: http://ezinearticles.com/?How-Do-Planes-Fly?&id=354788
