In the United States, LCCs hold almost 30 percent of the domestic market. Overall, Southwest was ranked first among the leading airlines in the U.S., with a market share of 19.1 in 2016, followed by legacy carriers Delta and American Airlines. With flights to more than 97 destinations, Southwest transported passengers over 124 billion miles, had a capacity of around 148.5 billion available seat miles (ASMs) and reported net profits of over 2.2 billion U.S. dollars in 2016. JetBlue Airways was ranked fifth, with a domestic market share of 5.5 percent and operating revenue streams of 6.6 billion U.S. dollars in 2016.
Of particular interest is the emergence of the ultra-low cost carriers (ULLCs), like Spirit Airlines, Frontier Airlines or Allegiant Air in the U.S. domestic market, all of which are benefiting from the low jet fuel prices. Based on its ultra-low cost business model, Spirit Airlines provides unbundled base fares with the option of booking other ancillary air-related products. It’s currently serving 59 destinations in the United States, Caribbean and Latin America. The company reported operating revenue streams of over 2.3 billion U.S. dollars from transporting passengers over more than 21 billion miles in 2016.