Cleveland although most of the service operated by North Central from the airport at this time was flown with Convair 580 turboprops with four daily direct one stop flights to Chicago O'Hare via Milwaukee, three daily direct one stop flights to Detroit via Lansing and two daily direct flights to Cleveland via stops in Lansing and Detroit. According to the OAG, United was still operating its mainline 737 jet service from Chicago (ORD) at the end of 1979 with only one daily nonstop flight; however, United then ceased serving Muskegon shortly thereafter. In the spring of 1981, Midstate Airlines, an independent commuter air carrier, was operating seven nonstop flights every weekday to Chicago O'Hare from Muskegon flown with Fairchild Swearingen Metroliner commuter propjets. By early 1985, three independent airlines were flying nonstop service from Chicago O'Hare to the airport including Air Wisconsin operating four flights every weekday with de Havilland Canada DHC-7 Dash 7 turboprops, Midstate Airlines operating six flights every weekday with Fairchild Swearingen Metroliners and Simmons Airlines operating four flights every weekday with NAMC YS-11 and Short 360 turboprops for a combined total of fourteen flights from O'Hare every weekday. At this same time in 1985, Air Wisconsin was operating nonstop DHC-7 Dash 7 service from Battle Creek, MI while Midstate was operating nonstop Metroliner service from Milwaukee and Traverse City with Simmons Airlines operating nonstop and direct Embraer EMB-110 Bandeirante turboprop flights from Detroit as well as nonstop NAMC YS-11 and Short 360 service from Traverse City in addition to nonstop Embraer EMB-110 or Short 360 flights from Flint, Grand Rapids and Jackson, MI. According to the OAG, these four air carriers were operating a combined total of 35 flights every weekday into the airport at this time in 1985. The June 1, 1999 OAG lists four nonstop flights to Chicago O'Hare operated every weekday by Great Lakes Airlines flying as United Express via a code sharing agreement on behalf of United with Beechcraft 1900 and Embraer EMB-120 Brasilia commuter propjets as well as five nonstop flights to Detroit every weekday operated by Mesaba Airlines with Saab 340 turboprops as Northwest Airlink code sharing service on behalf of Northwest Airlines and also three nonstop flights every weekday to Milwaukee operated by Skyway Airlines with Beechcraft 1900s flying Midwest Express Connection service on behalf of Midwest Express. Airline service to Chicago then ended in 2002. North Central Airlines