The United States has 17 major airlines as of April 2015, including Airtran Airlines, Alaska Airlines, American West Airlines, American Airlines andContinental Airlines. Delta Air Lines, Frontier Airlines, Jet Blue, Midwest Express, Northwest Airlines, Sun Country Airlines, Southwest Airlines, Spirit Airlines, U.S. Airways, United Airlines, and WestJet complete this list.
Additional passenger airlines in the US include Allegiant Air, American Trans Air, Atlantic Southeast Airlines, Baltia Air Lines, BigSky Airlines, California Pacific Airlines, Comair, Go!, Great Lakes Airlines, Gulfstream International, Hawaiian, Interstate Jet, Jet America, Mesa Air, Mokulele Airlines, North American Airlines, Pen Air, Primaris Airlines, Shoreline, Shuttle, SkyValue, Southeast Airlines, USA 3000 Airlines, Virginia America, and World Airways. Many of these airlines operate under the name of one of the major airlines and are primarily dedicated to a specific region. Additionally, the US Department of Transportation Bureau of Transportation Statistics has a list of all registered airline carrier names whether they are servicing passengers or freight.
The most popular airlines in the US in terms of the number of people that travel on them during the course of a year are Delta Air Lines, United Airlines, and Southwest Airlines, American Airlines, and US Airways in that ranking order. Delta Air Lines carries more than 170 million people a year on more than 5,400 daily flights.