Originally Posted by
GUWonder
DET is used to refer to Detroit in various corporate contexts, even as DET is indeed not a city or airport code commonly used by the airline and civil aviation community to refer to a Detroit airport.
As long as folks are being pedantic: DET actually
is a valid IATA code for the Coleman A. Young Municipal Airport in Detroit (which hasn't had commercial service since 2000). I believe it is still active for general aviation. (And yes, we all know the poster
meant DTW.)