Time could be running out for Spirit Airlines to continue operating, which would be bad news not only for its employees and customers but for all people seeking low-priced flights. For decades, the discount carrier has helped push prices down for domestic flights.

Spirit said in a filing last week that there was “ substantial doubt ” it could stay in business for more than a year due to continued losses and dwindling revenue. The Florida-based airline, which emerged from bankruptcy earlier this year, said it’s making changes to avoid being forced to shut down.

But if the airline does shutter, or is bought by a competitor, that could raise airfares across the board. Spirit’s model of offering no-frill, bargain fares (and charging passengers for any extras, including carry-on baggage)

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