Key Takeaways Spirit Airlines has rejected a renewed offer from Frontier Airlines, instead opting to continue with its bankruptcy restructuring.The sides detailed new communications from the last several weeks in SEC filings on Wednesday.

Frontier Airlines is attempting for a second time to merge with Spirit Airlines, which declared bankruptcy late last year as budget airlines struggle. Frontier Group Holdings Inc., the parent company of Frontier Airlines, said Wednesday that the proposed deal would include newly issued Frontier debt and common stock.

The parent of Frontier Airlines made a new offer to combine with bankrupt Spirit Airlines Inc., renewing its pursuit of the struggling budget carrier after talks fell apart last year.