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I meet Tom Spencer, an aircraft fitter, attaching some steel plates to the airframe.

In developing any new jet, Boeing engineers provide not only the design of the airframe but also instructions on how all the parts must be put together: the configuration.

As they ingest air from both the front and from the surface of the airframe, they don't have to work as hard to move the plane, so it burns less fuel.

Boeing has acknowledged that manufacturing changes had been made but said that the durability of the airframe was not affected, and the company has continued to express confidence in the plane and its safety.

Boeing concedes those manufacturing changes were made, but a spokesman for the company, Paul Lewis, said there was “no impact on durability or safe longevity of the airframe.”