Aircraft engines spew a host of gases that warp the climate at high altitudes, including nitrogen oxides, sulphur dioxide and water vapour.

According to a release from the union, the dispute is over forced changes to terms and conditions for workers, including "inflexible" work schedules.

Boeing 777X is billed as the world's largest twin-engine airplane, and was first scheduled to enter service in 2020.

Ortberg told the presidents of Boeing’s largest workers union and another labor group that he’s seeking “a new contract where we can come together to build a strong future for our employees in the region."

The deal will also include wing and maintenance work, with Rolls-Royce estimating that the engines will cut emissions by 14%. 

Manufacturers are now asking whether they should reach further back in the chain, in their pursuit of both resilience and growth opportunities.

The complaints were raised during the second day of an extensive hearing held by the U.S. National Transportation Safety Board.

One worker claimed that his team was "replacing doors like we were replacing our underwear," and that planes would arrive "jacked up every day."

The allegation builds upon CrowdStrike’s claim that Delta rejected the cybersecurity provider's repeated attempts to help.

Our annual 100 Great Supply Chain Partners issue is dedicated to showing what supply chain excellence looks like in the real world — through partnership.