Worth (DFW) with Beechcraft 99 propjets. Trans States served Springfield, IL nonstop with Swearingen Metro III propjets. The F-27 propjets proved to be very successful. DHC-8 Dash 8 propjets were then acquired. I propjets in addition to Cessna Citation business jet aircraft. American Eagle later operated ATR-72 propjets into the airport before introducing regional jet service. This commuter airline operated Dornier 328 propjets. Electra propjets with the airline then replacing this turboprop service with Boeing 737-200 jet flights. The Dash 8 aircraft have since been replaced with new ATR 72-600 propjets. Currently, Horizon Air operates Bombardier Q400 propjets into Walla Walla on behalf of Alaska Airlines. The Jetstream turboprops were then replaced with Swearingen Metroliner propjets on the Northwest Airlink service. Later that year, 19-passenger British Aerospace BAe Jetstream 31 propjets were added to the fleet. American Eagle replaced these propjets with Embraer regional jets. Air Midwest used 17-seat Swearingen Metroliner propjets with flights to Albuquerque, Amarillo, and Wichita. Hawaiian currently operates Boeing 717-200 jets and ATR 42-500 propjets on its interisland flights.