Just five months after emerging from Chapter 11 bankruptcy protection, 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 over the next year - which is accounting-speak for running out of money. In a quarterly report issued Monday, Spirit pointed to "adverse market conditions" that it's continued to face after a recent restructuring and other efforts to revive its business.

A Spirit Airlines 319 Airbus approaches Manchester Boston Regional Airport for a landing, Friday, June 2, 2023, in Manchester, N.H. AP Photo/Charles Krupa, File

That includes weak demand for domestic leisure travel, which Spirit said persisted in the

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