Republic Airlines was an airline in the United States that operated from 1979 until it merged with Northwest Airlines in 1986. Republic was formed by the merger of North Central Airlines and Southern Airways on July 1, 1979. Their headquarters were at Minneapolis–Saint Paul International Airport, in what is now Fort Snelling in unincorporated Hennepin County, Minnesota. The former headquarters is now Delta Air Lines Building C.

Detroit Metropolitan Wayne County Airport is the primary international airport serving Detroit and its surrounding metropolitan area in Michigan, United States. It is located in the City of Romulus and is Michigan's busiest airport.