American Airlines has accused mechanics unions of an intentional slowdown that has resulted in more than 900 flights being cancelled within the last two months. The airline is seeking compensation for the damages associated with the aforementioned cancelled flights. American claims that the unions have caused significant losses financially, and damaged the airline's relationship with customers.
See "Labor tensions flare at American Airlines over hundreds of canceled flights", Leslie Josephs, CNBC, August 14, 2019