Spirit, which filed for bankruptcy protection last year, says it has rejected the new Frontier overture but would be open to a higher offer.

Frontier and Spirit Airlines will once again try to merge, only months after the Biden administration won a key antitrust court battle to block an attempt by JetBlue to buy Spirit. A combination of the two ultra-low-cost carriers would produce the country’s fifth largest airline,

Frontier had pitched the bankrupt airline on a coupledom that it claimed would have created a formidable low-cost competitor in the battle for passengers against American Airlines, Delta, Southwest, and United. While Spirit said a merger could create a “potent competitor in the marketplace” they’re just not that into it.