US regulators on Wednesday 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. The Federal Aviation Administration said the approval followed "an unprecedented level of collaborative and independent reviews by aviation authorities around the world." The plane was grounded after two crashes that killed a total of 346 people in 2018 and 2019. A principal cause of the two crashes was identified as a faulty flight handling system that was supposed to keep the plane from stalling as it ascended, but instead forced the nose of the plane downward. The FAA required Boeing to upgrade this system to address the flaw.