Spirit Airlines has been attempting to rebrand as a more premium airline to keep pace with the latest travel trends that have challenged the viability of its ultra-low-cost model.

U.S. no-frills pioneer Spirit Airlines Inc. SAVE-N filed for fresh Chapter 11 bankruptcy protection on Friday, as dwindling cash and mounting losses derailed its turnaround efforts since emerging from a previous reorganization in March.

The carrier, recognizable by its bright yellow jets, has struggled to steady operations since emerging from its first bankruptcy in March .

Flights, ticket sales, reservations and operations will continue, the airline said on Friday.

The company said it was working productively with its secured noteholders, including with respect to potential financing that may become nece

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