More than 20 months after it was grounded following two deadly crashes, Boeing's 737 MAX returned to the skies Wednesday with a commercial flight in Brazil, said AFP journalists on board. Low-cost airline Gol's Flight 4104 from Sao Paulo to the southern city of Porto Alegre took off using the revamped jet in a first that Boeing hopes will turn the page on a badly damaging crisis in the wake of the 2018 and 2019 crashes, which killed a total of 346 people. bur-jhb/dw