In addition, Cascade had its major maintenance base located at the airport for all of the aircraft types it operated including the BAC One-Eleven jets. West Coast then merged with Bonanza Air Lines and Pacific Air Lines to form Air West, which was subsequently renamed Hughes Airwest. Both Air West and Hughes Airwest continued to serve Walla Walla with Fairchild F-27 propjet flights, although by 1975 Hughes Airwest had turned over all of its service to Cascade Airways. Currently, Horizon Air operates Bombardier Q400 propjets into Walla Walla on behalf of Alaska Airlines. The Q400 is the latest, largest, and fastest member of the Dash 8 family of turboprop aircraft.