Four forces keep an airplane in the sky. They are lift, weight, thrust, and drag.
Lift pushes the airplane up. The way air moves around the wings gives the airplane lift. The shape of the wings helps with the lift, too.
Weight is the force that pulls the airplane towards Earth. Airplanes are built so that their weight is spread from front to back- this keeps the airplane balanced.
Thrust is the force that moves the airplane forward. Engines give thrust to the airplane. Sometimes an engine turns a propeller, and sometimes its a jet engine. It doesn't matter, as long as air keeps going over the wings.
Drag slows the airplane. Airplanes are designed to let air pass around them with less drag.
Source: {http://www.NASA.gov/audience/forstudents/k-4/stories/ames-how-do-planes-fly-text.html}
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