The Airplane Service Station, also known as the Powell Airplane, is a service station built in 1930 in the shape of an airplane. Located at 6829 Clinton Highway in Powell, an unincorporated community in Knox County, Tennessee, it is on the National Register of Historic Places.The station was built by brothers Elmer and Henry Nickle. Their intent was to increase business by having a service station that was visually unique, both to area residents and to travelers on newly widened U.S.