Frontier Vs Spirit Airlines: Ultra-Low-Cost Cabins Compared

Spirit Airlines and Frontier Airlines have a lot in common. Both are ultra-low-cost US-based airlines operating fleets of Airbus A320 aircraft. They both focus on domestic routes overlooked by the larger US-based carriers. They both offer international flights for leisure destinations in the greater Caribbean/Central American region, but not to international destinations like Canada where they would need to accept Canadian dollars.