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Q:

Why don't all planes have winglets?

A:

Winglets are upwardly bent tips on an airplane wing that help lower vortex drag.  Winglets are usually found on large planes with long wings. Long wings make an airplane heavier, make it more difficult to move and take up more space. While large airliners benefit from long wings, not all airplanes do. Smaller aircraft, such as fighter planes, don't need longer wings, which is why not all airplanes have winglets.