The union for Southwest Airlines Co. pilots sued Boeing Co., saying the manufacturer rushed output of the 737 Max jet to stay competitive, withholding key information about a feature that contributed to two fatal crashes within five months.

"Boeing made a calculated decision to rush a re-engined aircraft to market to secure its single-aisle market share and prioritize its bottom line," said the Southwest Airlines Pilots Association suit. The union said it's seeking at least $115 million for damages sustained through the end of this year, primarily for lost pay and legal expenses.

"Boeing abandoned sound design and engineering practices, withheld safety critical information from regulators and deliberately misled its customers, pilots and the public about the true scope of design changes," the suit said.