Trans States Airlines was a regional airline owned by Trans States Holdings and headquartered in Bridgeton, Missouri. At the time of its closing, the airline operated flights for United Airlines under the United Express brand. Trans States Airlines ceased all operations on April 1, 2020. History The company began operations as Resort Air in 1982. As an independent commuter air carrier, Resort Air operated Swearingen Metro propjets from a small hub located in St. Louis (STL) with service to Carbondale, Illinois; Columbia, Missouri; Fort Leonard Wood, MO; Joplin, MO; Lake of the Ozarks, MO; Springfield, IL; and Springfield, MO. In 1985, the company entered into an agreement with Trans World Airlines (TWA) to operate as Trans World Express serving six cities in Missouri and Illinois. In 1989 Resort Air changed its name to Trans States Airlines. Many new aircraft were added to replace the Swearingen Metro's including the British Aerospace Jetstream model 31 and model 41 as well as much larger ATR-42's and ATR-72's. New service was added to many more cities from St. Louis and in 1999, Embraer ERJ-145 regional jets were added for the Trans World Express system expanding service to several cities much further distant from St. Louis. In 1993 TSA began operations on the west coast as USAir Express at Los Angeles (LAX) with service to Fresno, Monterey, Ontario, CA, Orange County, Palm Springs, San Diego, and Santa Barbara nonstop from LAX with British Aerospace BAe Jetstream 31 propjets. The operation continued until the year 2000. On the east coast, in 1995, TSA began operations as a code share feeder airline into New York City JFK Airport for both Trans World Express and United Express. By 1999, Trans States had begun operations as a Delta Connection code share air carrier for Delta Air Lines at New York JFK Airport with Embraer ERJ-145 regional jets and British Aerospace BAe Jetstream 41 propjets with nonstop service to Albany, NY, Baltimore, Greensboro, NC, Hartford/Springfield, Norfolk, VA, Philadelphia, Pittsburgh, Raleigh/Durham, Richmond, VA and Rochester, NY. Flights under the USAirways Express banner were also performed at Pittsburgh. In December 2001, TWA merged into American Airlines and all Trans States flights operating as Trans World Express then began flying as American Connection. American later dismantled the St. Louis hub operation created by TWA and the American Connection flights ended in 2009. In 2015 American merged with US Airways and the US Airways