Boeing Co’s best-selling jet, the 737 MAX, was grounded globally in March, days after the crash of an Ethiopian Airlines flight that followed a similar Lion Air disaster in Indonesia in October. Boeing has spent months working on updating critical flight control software at the center of both crashes, with the hope of winning Federal Aviation Administration approval for the planes to fly again in the United States between October and December. Following are some of the key steps that need to take place before the 737 MAX returns to the skies.

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