737 MAX on Monday, people familiar with the matter told Reuters.The test is a pivotal moment in Boeing’s worst-ever corporate crisis, long since compounded by the COVID-19 pandemic that has slashed air travel and jet demand.The grounding of the fast-selling 737 MAX in March 2019 after crashes killed 346 people in Ethiopia and Indonesia triggered lawsuits, investigations by Congress and the Department of Justice and cut off a key source of Boeing’s cash.