[4] By 1999, Trans States had begun operations as a Delta Connection code share air carrier for Delta Air Lines at New York's JFK Airport with Embraer ERJ 145 regional jets and 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.

[9] In 2006 Trans States briefly operated a small hub at San Antonio, Texas flying Embraer ERJ 145s.

[10] 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.

In 2015, the airline began a hub operation at Denver under the United Express banner and carried 3.6 million passengers for the year.

However, on March 17, 2020, CEO Rick Leach sent a memo to employees stating that due to the impact of the COVID-19 pandemic on aviation, the airline would cease operations on April 1, 2020, much earlier than originally expected.

[15] Trans States Holdings held conversion rights to take the smaller, 76-seat MRJ70 instead of the 92-seat MRJ90 dependent on the scope clause environment by the time the airline took delivery.

[16] The order was cancelled as of October 2019 due to concerns that the Mitsubishi SpaceJet M90 aircraft violates the US Scope clause laws.