Why Doesn't The Boeing 737 Have Landing Gear Doors?

The Boeing 737 has a set of two wheels for its nose landing gear and two sets of two wheels for the main landing gear. This is a common layout for single-aisle planes, shared by the Airbus A320, for example. What isn't shared with the Airbus, however, is how the gear functions. The main landing gear extends and retracts largely the same, but while the A320 has doors to cover the gear wells, the Boeing does not.

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