Founded in January 1997 under the name WestJet Express, the company went on to adopt its current name in the following year after several trademark disputes. After filing for Chapter 11 bankruptcy in December 2000, the company would later undergo restructuring using a low-cost model that focused on smaller markets not served by major aircraft companies. In 2019, Allegiant Air’s total operating revenue stood at 1.84 billion U.S. dollars and its operating expenses for that same year amounted to around 1.47 billion U.S. dollars.
The airline currently does not serve any international destinations. Although Allegiant flies into some major airports, most of its destinations are smaller cities or secondary airports that serve larger cities. Some of its main airports include McCarran International Airport, Fort Lauderdale–Hollywood International Airport, Los Angeles International Airport and Orlando Sanford International Airport. Allegiant Air transported over 14.8 million passengers on approximately 15.55 billion available seat miles in the fiscal year of 2019.