From March 2018 to April 2023, Air Wisconsin returned to operate as a United Express carrier, with hubs at Chicago–O'Hare International Airport (ORD) and Washington–Dulles.

The agreement with American is set to conclude in April 2025, after which the airline plans to transition to only flying charter and Essential Air Service subsidized flights.

[citation needed] By 1985, Air Wisconsin had become a large independent regional air carrier operating BAe 146-200 and British Aircraft Corporation BAC One-Eleven jets as well as de Havilland Canada Dash 7 turboprops with flights as far west as Grand Island, Nebraska, and Minneapolis/Saint Paul, and as far east as Bridgeport and New Haven, Connecticut, with a large connecting hub located at Chicago's O'Hare Airport (ORD).

[12][13] By early 1986, the airline was serving sixteen airports with its British-manufactured jets with flights to Appleton, Bridgeport, Cedar Rapids, Iowa, Chicago–O'Hare, Flint, Michigan, Fort Wayne, Indiana, Grand Island, Green Bay, Wisconsin, Kalamazoo, Michigan, Lincoln, Nebraska, Moline, Illinois/Quad Cities, New Haven, South Bend, Indiana, Toledo, Ohio, Waterloo, Iowa, and Wausau/Stevens Point, Wisconsin, Oshkosh, Wisconsin, with other flights and destinations in its route system being served with the Canadian-manufactured four engine Dash 7 turboprop.

[citation needed] On May 17, 1985, it merged with Mississippi Valley Airlines (MVA) and continued to fly as United Express, operated by Air Wisconsin.

[15] According to the Official Airline Guide (OAG) at this time, United Express flights were operated with BAe 146-200 jets and Fokker F27 turboprops nonstop to Chicago–O'Hare from Akron/Canton, Ohio, Appleton, Cedar Rapids, Champaign, Illinois, Fort Wayne, Green Bay, Kalamazoo, La Crosse, Wisconsin, Lansing, Michigan, Lexington, Kentucky, Moline/Quad Cities, Oshkosh, Wisconsin, Peoria, Illinois, Roanoke, Virginia, South Bend, Toledo, and Wausau, and with BAe 146-200 jets and Short 360 turboprops nonstop to Washington Dulles from Charleston, West Virginia, Charlottesville, Virginia, and Richmond, Virginia, as well as Harrisburg, Reading, and State College, Pennsylvania.

Towards the end of the contract with United Airlines Air Wisconsin was unable to secure a long-term deal or extension to continue providing regional service for UAL.

In 2005 AWAC began operating all of its CRJ200 regional jets as a US Airways Express carrier with flight crew bases located in Philadelphia, New York LaGuardia, Washington Reagan National, and Norfolk, Virginia.

[19] In September 2021, the company announced that they had signed a lease for at least 1 Bombardier CRJ200SF (converted cargo aircraft) set to enter service from December 2021.

On August 22, 2022, Air Wisconsin announced a five-year contract to operate up to 60 CRJ200s for American Eagle, starting in March of 2023.

[29][failed verification] Operating as American Eagle, Air Wisconsin pilots and flight attendants have crew domiciles at the following locations:[30] The Air Wisconsin fleet comprises the following aircraft (as of July 2024):[31][32][33] In 2016, the airline retired four CRJ200 regional jets that had met their structural time limit and sent them to Tupelo Regional Airport (TUP) in Tupelo, Mississippi.

Air Wisconsin's primary aircraft painting is located in Fort Worth, Texas – Meacham International (FTW).