JetBlue has made a $3.6 Billion cash offer for Spirit Airlines. Spirit has already agreed a merger with Frontier Airlines. The combination of Frontier and Spirit was a much more obvious proposition given that the two airlines share most key characteristics in their ultra low-cost business models. JetBlue positions itself a a premium LCC and integration with Spirit could be more problematic. Unlike Spirit and Frontier JetBlue does not use the Navitaire PSS from Amadeus although it was the launch customer for Navitaire's New Skies system which it used until 2010 when it switched to Sabre.