WASHINGTON/SEATTLE (REUTERS) – After nearly two years of scrutiny, corporate upheaval and a stand-off with global regulators, Boeing Co won approval on Wednesday (Nov 18) from the US Federal Aviation Administration to fly its 737 Max jet again after two fatal disasters.

The FAA detailed software upgrades and training changes Boeing must make in order for it to resume commercial flights after a 20-month grounding, the longest in commercial aviation history.

The 737 Max crashes in Indonesia and Ethiopia killed 346 people within five months in 2018 and 2019 and triggered a hailstorm of investigations, frayed US leadership in global aviation and cost Boeing some US$20 billion (S$27 billion).