Discount carrier says a merger would be a better path out of bankruptcy for Spirit, which has rebuffed the latest proposal.

Frontier Airlines hoped to create a low-cost airline giant, but Spirit isn’t interested—at least, not at this price. Spirit Airlines has rejected a merger offer with Frontier as it prepares to exit bankruptcy.

Spirit Airlines rejected Frontier Airlines’s second merger bid, opting to continue on its current path to emerge from bankruptcy. The low-cost airline filed for bankruptcy last year after the Justice Department blocked a proposed merger with JetBlue.