A rejection of the deal would have triggered a lockout starting on May 2 at the Mirabel manufacturing plant near Montreal.

Implementing advanced technologies such as an MES allows businesses to alleviate the immediate challenges associated with staffing shortages, and lay the groundwork for long-term workforce resilience.

Lufthansa estimates weeks of airline worker strikes impacted first quarter earnings by as much as €350 million.

Spirit, which was spun out of Boeing in 2005, is in an increasingly stretched financial position as the U.S. planemaker slows output of its 737 aircraft. 

The planemaker saw revenue fall 8% year-over-year in Q1, in what CEO David Calhoun called a "tough moment" in a letter to employees.

Alaska shares gained 5% in New York after earlier rising as much as 7.1%, the most in more than two years.

One witness said there was a disconnect between Boeing management's words about safety and what workers observe on the factory floor.

Boeing vice president Lisa Fahl says that the number of workers using the company's service to report safety concerns has risen by 500%.

The union message underscores the heightened scrutiny on airline safety following a January incident in which a panel blew off the side of an Alaska Airlines plane mid-flight.