American Air Union Sues Over Plan for Training New Pilots (1)

American Airlines Group Inc. was sued by its pilots union to block a plan that would seek volunteers to help with flight-simulator training amid record hiring.

The plan would violate the Railway Labor Act, which prohibits unilateral changes to contracts between airlines and their unions, according to the suit, filed Thursday by the Allied Pilots Association in a federal court in Texas.

The case comes a day after the union told members not to sign up to assist with simulator training. The work typically is the responsibility of so-called check pilots, not those who fly regularly for the carrier.

“The ...