Boeing 737 MAX
After two fatal crashes of MAX 8 aircraft in October 2018 and March 2019, regulatory authorities around the world ordered airlines to stop using MAX 8 and MAX 9 airplanes until the reason for the crashes is found. Boeing stopped making them for a few months in early 2020, and resumed at a slow rate. Various regulatory authorities authorized a return to service in December 2020 and January 2021.