MBS International Airport is located in Freeland, Michigan, serving the nearby cities of Midland, Bay City, and Saginaw. It was formerly named Tri City Airport. The airport was renamed to MBS International Airport in 1994 (representative of its IATA airport code) to prevent confusion with other airports named "Tri City Airport" across the United States.

The fourth busiest commercial airport in Michigan, it is a special municipal body owned by Bay County and the cities of Midland and Saginaw. The airports's name is an initialism formed from the names of the three owning communities. It is governed by a nine-member commission made up of three members from each of the owning communities.