Southwest Airlines filed a lawsuit against its mechanics union on Thursday, accusing the workers of an illegal campaign to disrupt operations in order to improve their position in prolonged labor talks.
Southwest and Aircraft Mechanics Fraternal Association, which represents some 2,400 mechanics at the low-cost carrier, have been in contract negotiations since 2012.
In a lawsuit filed in Texas, Southwest asked a federal judge to order a halt to what it called an unlawful job action by the union.
AMFA did not immediately return a request for comment.
Reporting by Tracy Rucinski; Editing by Simon Cameron-Moore