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,

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

In a presentation to Spirit dated Jan, 28, Frontier said a merger would create the nation's fifth-largest airline and "the first formidable low-cost challenger to the Big Four," referring to competitors American Airlines, United Airlines, Southwest Airlines and Delta Air Lines.