A class-action lawsuit against Spirit Airlines has been revived by a federal appeals court.

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The lawsuit claimed that the low-cost airline deliberately surprised passengers with unexpected fees for their carry-on bags with tickets purchased through discount websites such as Cheapoair, Expedia and Priceline, Reuters reported Wednesday.

The 2nd U.S. Circuit Court of Appeals vacated a lower court’s ruling, allowing 22 people to sue Spirit Airlines for breach of contract.

According to Reuters, the court made its decision because Spirit didn’t appear to let passengers know about “ambiguities” in the prices they would pay, between their tickets and the fees for carry-on bags.