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Studies have consistently shown that nonstandard work schedules -- working outside the traditional nine-to-five workday -- can negatively impact physical and mental health as well as social and family life.

"We actually had to do something nonstandard to achieve this," Bonagiri said.

Spirit told Boeing that a nonstandard manufacturing process had been used by a subcontractor to fabricate two of the eight heavy metal fittings that attach the MAX’s vertical tailfin to the fuselage.

However, they don’t fit nonstandard spaces very well, and they’re harder to retrofit into existing spaces, so they work best in new construction.

In that case, “a nonstandard manufacturing process” affected two out of eight fittings that attached the tailfin to the fuselage.