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 said in a release that it has met with Spirit’s board and executives since it made its proposal this month.

Frontier is making an offer to acquire the beleaguered Spirit Airlines, which filed for bankruptcy in November.