Muskegon with this flight then continuing on to Grand Rapids, Lansing and Detroit. Capital Airlines was then acquired and merged into United Airlines which in 1963 was continuing to serve Muskegon. According to the August 1963 United system timetable, the airline was serving the airport with Vickers Viscount turboprops as well as Douglas DC-6B prop aircraft with Viscount service including a westbound flight operating a routing of Washington D.C. National Airport - Detroit Willow Run Airport - Lansing - Grand Rapids - Muskegon - Chicago O'Hare Airport and an eastbound Viscount flight operating a routing of Chicago O'Hare - Muskegon - Saginaw, MI - Flint - Detroit Willow Run Airport - Cleveland - Pittsburgh. United Douglas DC-6B service at this time in 1963 included a westbound flight operating a routing of Detroit Willow Run - Flint - Saginaw - Muskegon - Chicago O'Hare - Moline, IL - Cedar Rapids - Des Moines - Omaha and an eastbound flight operating a routing of Cedar Rapids - Chicago O'Hare - Muskegon - Saginaw - Flint - Detroit Willow Run - Akron, OH - Youngstown, OH - Pittsburgh. By 1969, United Airlines was operating all of its flights into Muskegon with Boeing 737-200 jets with three daily nonstops to Chicago O'Hare with one of these flights providing direct, no change of plane service to Omaha and Lincoln, NE with another 737 flight operating direct one stop service from Cleveland via Flint. Also in 1969, North Central Airlines was operating eight daily Convair 580 turboprop flights from the airport with nonstop service to Grand Rapids, Lansing and Milwaukee as well as direct one stop service to Chicago O'Hare and also direct one or two stop service to Detroit. According to the Official Airline Guide (OAG), United was continuing to serve the airport in 1975 with three daily flights operated with Boeing 737-200 jets with one service operating an eastbound routing of Chicago O'Hare Airport - Muskegon - Flint, MI - Cleveland - Baltimore with another service operating a westbound routing of Boston - Cleveland - Flint - Muskegon - Chicago O'Hare Airport with a third flight operating an additional nonstop service to Chicago O'Hare. Another airline operating jet service into the airport in 1975 was North Central operating McDonnell Douglas DC-9-30 service with one daily flight operated on an eastbound routing of Chicago O'Hare Airport - Milwaukee - Muskegon - Lansing - Detroit -