Southwest Airlines is an American low-cost airline based in Dallas, Texas. Southwest is the largest airline in the United States, based upon domestic passengers carried. Southwest operates more than 3,400 flights a day, as of March 2011, utilizing a fleet of 552 aircraft.
This Canadian low cost airline flies across Canada, to the United States and now to points in the Caribbean. Westjet is also loosely allied with Southwest Airlines.
AirTran is a low cost airline that serves dozens of US markets.
JetBlue continues to be well-ranked among US airlines for customer service, as well as having a broad range of routes across the United States and the Caribbean.
In its short tenure as an airline, Virgin America is known for its innovation with WiFi, and inflight options, and for good customer service.
Spirit Airlines has been likened to Europe`s Ryanair as not just a low cost airline, but no frills one as well.
Air Transat is an airline based in Saint-Laurent, Montreal, Quebec, Canada, operating scheduled and charter flights, serving 60 destinations in 25 countries. The airline is owned and operated by Transat A.T. Inc. During the summer season its main destinations are Europe and in the winter season the Caribbean, Mexico, USA and Central America.
Frontier Airlines has its main hub in Denver and serves several cities in the United States.