A Boeing 737 Max airliner is shown at the Boeing Factory in Renton, Wash., in November. European aviation regulators gave the all-clear to return to service following a pair of deadly crashes in 2018 and 2019.

A Boeing 737 MAX airliner is pictured at the Boeing Factory in Renton, Washington on November 18, 2020. – US regulators on November 18 cleared the Boeing 737 MAX to return to the skies, ending its 20-month grounding after two fatal crashes that plunged the company into crisis. (Photo by Jason Redmond / AFP) (Photo by JASON REDMOND/AFP via Getty Images)