United is a founding member of the Star Alliance, the world's largest airline alliance with a total of 28 member airlines. Regional service is operated by independent carriers under the brand name United Express. Its main competitors are American Airlines, Delta Air Lines, Alaska Airlines, and Southwest Airlines.What airlines are in the Delta Alliance?
Delta is one of the four founding members of the SkyTeam airline alliance, and operates joint ventures with Aeroméxico, Air France-KLM, Alitalia, Korean Air, Virgin Atlantic, Virgin Australia, and WestJet.What type of planes does Allegiant fly?
Allegiant operates the McDonnell-Douglas MD 82/83 and McDonnell-Douglas MD 87 series aircraft. Both are powered by two (2) tail-mounted Pratt & Whitney turbofan engines. Both aircraft have two (2) flight deck crew members and three (3) in-flight crew members The MD 82/83 aircraft has 150 coach class seats.