Boeing 737 Max takes flight for first time in US after deadly crashes

The aircraft was cleared to fly again in November after the company modified its previously flawed flight control system, which pilots didn’t know about and had caused some aircrafts to nosedive.
1:47 | 12/30/20

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Transcript for Boeing 737 Max takes flight for first time in US after deadly crashes
Next tonight, Boeing 737 max jets are back in service. American airlines today flying the first paying passengers in the U.S. Since the fleet was grounded nearly two years ago, following two deadly crashes overseas. ABC's gio Benitez covering aviation for us. Reporter: Tonight, the 737 max taking flight, carrying paying passengers in the U.S. For the first time in nearly two years. I have the utmost confidence and safety of this aircraft. Reporter: The American airlines flight taking off from Miami, landing safe lip at new York's Laguardia airport. Were you thinking about those crashes? I was thinking about them when we were taking off. The flight crew was amazing. I was definitely more at ease. Reporter: For now, American is the only U.S. Airline operating the 737 max. United and southwest airlines saying they plan to start flying sometime in the new year. This airplane, I feel, is the most scrutinized airplane that we've ever seen. Reporter: It has taken 20 months and thousands of hours of investigations, pilot retraining, inspections and extensive updates to reach this point. Here in the max cockpit, you won't see any changes, but Boeing has completely updated its flight control system and that is all in the software. Congressional investigators say design flaws, faulty assumptions about pilot responses and management failures at Boeing and the FAA that led to those two fatal crashes in Indonesia and Ethiopia. Families who lost loved ones saying tonight the planes should be grounded forever. I wouldn't trust them. There's nothing that they could say or do apart from scrapping the max. Reporter: And tonight, American says, if you're booked on a max plane, the company will alert you and give you the option to change or cancel your flight. Tom? Gio Benitez for us tonight.

This transcript has been automatically generated and may not be 100% accurate.

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