Delta Air Lines Inc. subsidiary Comair Inc. won bankruptcy court approval Friday, July 21, to terminate its contract with its flight attendants, increasing pressure on the holdout union to reach a concession deal with the regional airline.

In his ruling, Judge Adlai Hardin of the U.S. Bankruptcy Court for the Southern District of New York wrote that the Erlanger, Ky.-based airline “has demonstrated beyond doubt that a material reduction in Comair’s flight attendant costs is essential to the company’s ability to be successful in the extraordinarily competitive regional airline market.”