Mesa Airlines, Inc. operates regional jet and turboprop aircrafts. The company also operates as US Airways Express under code-share agreements with US Airways; United Express under a code-share agreement with United Airlines, as well as independently in Hawaii as go!. In addition, it carries freight and express packages on its passenger flights and holds interline small cargo freight agreements with various other carriers. The company serves various cities in the United States, Canada, and Mexico. The company was founded as Mesa Airlines in 1982 and changed its name to Mountain West Airlines in 1994. Later, it changed its name to Mesa Airlines, Inc. in 1997. The company is based in Phoenix, Arizona. Mesa Airlines, Inc. operates as a subsidiary of Mesa Air Group, Inc.