Several airlines in the United States have decided to offer rescue fares to Spirit Airlines passengers who may have been stranded after the airline ceased operations early Saturday morning.
Southwest and United Airlines have capped these fares, while American Airlines has not disclosed its pricing. Delta and JetBlue have not issued statements about possible special fares to Spirit passengers.
You can access American Airlines here, Frontier here, Southwest Airlines here, and United Airlines here.
American Airlines
Frontier
Southwest Airlines
United Airlines
Conclusion
There is nothing yet on Delta or JetBlue at the time of writing, and, unfortunately, these airlines don’t offer standby travel free of charge for 24 to 48 hours for Spirit Airlines travelers stranded on their trips.
This may temporarily increase fares in the United States, as legacy carriers have tended to match their fare sales on overlapping routes.
Source