Southwest Airlines is primed to take over Frontier Airlines in an auction that starts later this week.
Southwest has confirmed it's put in a bid for more than $170 million for the Denver–based airline.
The auction could end by Friday.
Republic had made a $108.7 million offer to buy frontier and its subsidiary, Lynx Aviation. Southwest, a rival of Frontier's at Denver International Airport, had said it was willing to offer $113.6 million.