It comes as talks of a government-backed rescue have stalled.
The no-frills carrier says flights are currently operating as normal.
RELATED: Is Spirit Airlines shutting down? What to know if you have tickets
Travelers can book tickets, and existing flights are on schedule as of now.
The exact number of days before a possible liquidation is still unclear.
A possible bailout of Spirit has been met with bipartisan backlash on Capitol Hill.
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