Frontier Airlines to merge with Spirit, creating 5th largest airline in the U.S. Frontier Airlines and Spirit — the nation's two largest low-cost carriers — are set to merge to create the fifth-largest airline in the country, in a deal valued at more then $6.5 billion. Frontier Airlines and Spirit — the nation's two largest low-cost carriers — are set to merge to create the fifth-largest airline in the country, in a deal valued at more then $6.5 billion. Business
Frontier Airlines and Spirit — the nation's two largest low-cost carriers — are set to merge to create the fifth-largest airline in the country, in a deal valued at more then $6.5 billion.
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