A Manhattan-based federal appeals court has wiped out more than $15 million in damages awarded to American Airlines, as the successor-in-interest to US Airways, in an antitrust case against the provider of the country’s largest network for booking airline flights.

The U.S. Court of Appeals for the Second Circuit on Wednesday ordered a new trial in the case, which accused Sabre Holdings Corp. of monopolization and unlawfully restricting trade under the Sherman Act.