Budget carrier Frontier Airlines announced on Wednesday that it has made another bid for fellow discount carrier Spirit Airlines, which is in bankruptcy, for an undisclosed sum.

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.

(Reuters) - Spirit Airlines on Wednesday said it expects to exit bankruptcy in the first quarter and rejected a merger with rival Frontier Group, saying it was not favorable for the low-cost carrier.