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Frontier Airlines’ parent company is offering to buy Spirit Airlines in a $2.9 billion cash-and-stock deal that will create the nation's fifth largest carrier.

In a pair of lawsuits filed in federal court, a group of pilots and flight attendants says Frontier Airlines failed to accommodate the needs of pregnant and nursing women.

U.S. airlines are increasing their emissions of climate-changing gases much faster than they are boosting fuel efficiency, according to an environmental…

Frontier Airlines pilots approved a new contract in voting that ended Thursday following nearly three years of negotiations.Of the pilots for the…

Frontier Airlines pilots will be voting on whether to accept a new contract proposal over the holidays.Union leaders on Wednesday unanimously backed…