• Frontier Airlines announced 20 new routes on Tuesday. • All but two of them are currently offered by its struggling rival, Spirit. • Spirit borrowed $275 million after warning that it might not survive another year.

Frontier Airlines is looking to capitalize on its rival's financial woes.

The budget carrier announced 20 new routes on Tuesday, with some fares as low as $29. They include key Spirit Airlines hubs like Fort Lauderdale, the beleaguered carrier's home base.

Starting in late November, Frontier said it will fly from Fort Lauderdale to Baltimore, Charlotte, Dallas/Fort Worth, Detroit, Chicago, and Houston.

It also announced six routes from Detroit, which ranks fourth for Spirit's passenger capacity, according to Deutsche Bank research. Some flights aren't planned to start

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