Frontier says a merger would be a better path out of bankruptcy for Spirit, as budget carriers struggle with high costs and competition.

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.

Frontier Airlines is attempting for a second time to merge with the now bankrupt Spirit Airlines, which declared bankruptcy late last year as budget airlines struggle.