4. JetBlue – For the sixth consecutive year, JetBlue won the J.D. Powers Award for best North American low-cost airline, besting major competitor, Southwest. It scored particularly well in customer satisfaction for aircraft and in-flight services and was one of a few budget carriers with a four-star rating by Skytrax. In addition, JetBlue was ranked second best among U.S. Airlines by this year’s Conde Nast Traveler’s Reader’s Choice Awards and Travel + Leisure’s World’s Best Awards.