Spirit Airlines will halt all flights at approximately 3 a.m. ET (0700 GMT) on Saturday following a failed rescue deal.
The airline's Chapter 11 restructuring collapsed after creditors and potential partners could not secure a capital injection or asset sale.
Spirit's shutdown ends its ultra‑low‑cost service, likely causing short‑term ticket price spikes as competitors absorb displaced demand.
The collapse follows a blocked $3.8 billion JetBlue merger and ongoing engine reliability problems that grounded part of its fleet.