For over a year ABC News correspondent Bob Woodruff and team have been traveling the world to investigate the deadly Boeing 737 MAX8 airplane grounded last year following two tragic crashes that killed 346 passengers from around the world On the heels of the 737 MAXs recent clearance to fly again next month 2020 reports this Friday night on the aircrafts controversial flight control software and how it mistakenly sent planes into deadly nosedives 2020 also investigates what Boeing knew about concerns with that flight control system and when they knew it