American Airlines wants two labor unions to pay damages and the company's attorney fees, saying they ignored a judge's order to quickly end a work slowdown by mechanics.
American hasn't put a dollar figure on its request but says the slowdown caused "enormous financial losses" from canceled flights.
Earlier this week, a federal judge ruled for American in its lawsuit against the Transport Workers Union and the International Association of Machinists and Aerospace Workers, which represent the mechanics.
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American says workers took longer to fix planes and refused overtime to pressure the company during contract negotiations.
The Fort Worth-based airline says the slowdown continued after the judge issued an injunction in May. The unions deny wrongdoing.
In 1999, a judge awarded American $45 million from its pilots' union over a sickout.