The FAA associated with aviation is the Federal Aviation Administration

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Aerodynamics, aeronautics, flight, navigation, piloting

internal aerodynamics and external aerodynamics. internal is related to flow of ducts and external to going away from the bodies.

Aviation merit badge was created in 1911. It was discontinued in 1941 and replaced by Aerodynamics, Aeronautics, Airplane Design and Airplane Structure merit badges. These were discontinued in 1952 and merged back into Aviation merit badge.

carpenters use it all the time Architecture, Surveying, Astrophysics, Aerodynamics and Aviation, just to name a few.