Southwest introduced a plan to retrofit its fleet with a new interior. Improvements include a modern cabin design, lighter and more comfortable seats made of eco-friendly products, increased under-seat space, new netted seatback pockets to provide more knee room, a new fixed-wing headrest, and improved ergonomics.

Allegiant Airlines is an American low-cost airline that operates scheduled and charter flights. As a major air carrier, it is the ninth-largest commercial airline in the United States.