Spirit Airlines passengers woke up Saturday to a travel disruption few had expected to see unfold so abruptly. The carrier canceled all flights early May 2 and said it had begun an orderly wind-down of operations, leaving travelers across the country to rebook trips with other airlines.

The airline said on its website that the shutdown was effective immediately. It also told customers not to go to the airport, saying all flights had been canceled and customer service was no longer available.

For travelers with upcoming Spirit tickets, the immediate reality is simple but difficult. Their flights will not operate, and they must look for another carrier if they still need to travel.

Refund options depend on how the ticket was purchased. Customers who booked with a credit or debit card are being directed to log in through Spirit’s website and request a refund. Those who booked through a travel agent have been told to contact that agent directly.

The situation is less clear for passengers who used vouchers or points. According to the airline’s guidance, those cases will be handled through the bankruptcy process, leaving some customers without a quick answer.

Several airlines have started offering limited help for affected travelers, though the availability of seats and fares may change quickly. American Airlines is offering rescue fares on overlapping nonstop routes and reviewing extra capacity. Frontier Airlines is offering up to 50 percent off base fares for eligible bookings made by May 10 for travel through Nov. 19.

JetBlue is offering $99 one-way rescue fares with proof of a Spirit booking through May 6, along with fare caps on some routes. Southwest Airlines is also offering special fares based on distance, with prices capped at up to $400 through May 6.

Those options may help some stranded passengers, but they will not cover every route or every travel date. Travelers are being urged to check which airlines serve their original route before making new plans.

Spirit has also made clear that it will not reimburse hotel stays or replacement flights. That leaves many passengers dependent on credit card protections, travel insurance or whatever refund path applies to their booking.

Customers who cannot get a refund directly may still have options. Credit card users can request a charge dispute, though they should act quickly because protection windows may expire within 60 days. Debit card users may also file a dispute for undelivered services, but success may be less certain.

Travel insurance could help in some cases, but only if the policy covers financial insolvency. Passengers should review their policy language before assuming they are protected.

Spirit had operated in New York before the shutdown, including service connected to New York City and upstate airports. Its sudden grounding is now being felt by travelers who depended on the airline’s lower fares and regional connections.

For many passengers, the next step is less about the reason behind the collapse and more about recovering money, finding another flight and limiting extra costs. The disruption has turned a weekend travel problem into a broader test of how quickly stranded customers can move through a system that no longer has Spirit staff available to help.