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Frontier Airlines is expanding into many of Spirit Airlines' markets, adding 20 new routes this winter. This move comes as Spirit faces financial difficulties, warning it might not survive another year. Frontier overlaps with Spirit on 35% of its capacity, making it a prime competitor. Frontier's CEO, Barry Biffle, while declining to comment on a potential acquisition, expects Frontier to gain significant market share if Spirit fails.

Prepared by Christopher Adams and reviewed by editorial team.