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Trans States Airlines is the 22nd largest American regional airline. Trans States Airlines, along with Compass Airlines and GoJet Airlines, is owned by Trans States Holdings and is headquartered in Bridgeton, Missouri.

As of 2011, Trans States Airlines employed 650 people throughout North America. The airline operates over 150 daily flights in 39 cities as United Express for United Airlines and US Airways Express for US Airways. In total, TSA carried 2.1 million passengers in 2011.

History
The company began operations as Resort Air in 1982. In 1985, the company entered into an agreement with Trans World Airlines to operate as Trans World Express serving six cities in Missouri and Illinois. The company changed its name to Trans States Airlines in 1989. That same year, TSA began operations as USAir Express with flights into Los Angeles. In 1995, TSA began operations as a feeder airline into JFK Airport as United Express.

The call sign "Waterski" and the ICAO 3-letter identifier "LOF," which stands for 'Lodge of the Four Seasons', are from the early days when the company was operated as Resort Air and took visitors to the Lake of the Ozarks in Missouri.

Airline Operations
Trans States Airlines is headquartered in Bridgeton, Missouri where its main training facility and maintenance facility are located. The airline has crew domiciles in Chicago–O'Hare, St. Louis and Washington–Dulles. It operates hubs for United Express in Houston at George Bush Intercontinental Airport, Cleveland at Cleveland Hopkins International Airport and in Washington, DC at Washington Dulles International Airport.