Spirit Airlines says it might not survive unless it raises cash quickly.

After cutting its debt during restructuring, Spirit has tried to attract bookings by marketing more upscale products and looking for new ways to cut costs.

Just months after emerging from Chapter 11 bankruptcy, Spirit Airlines is warning about its future ability to stay in business. Spirit Aviation Holdings, the budget carrier's parent company, says it has “substantial doubt” about its ability to continue as a going concern within the next year — which is accounting-speak for having