Boeing 737 MAX with 100 people aboard returns to service with first US commercial flight since entire fleet of jets was grounded in March 2019 after two deadly crashes American Airlines Flight 718 on Tuesday is the first US flight of a 737 MAX in 21 months Flight took off smoothly from Miami and landed at LaGuardia in New York shortly after 1pm Passengers were booked normally for the flight but had the option to switch if they were uncomfortable The MAX was grounded in March 2019 after deadly crashes in Indonesia and Ethiopia In all, 346 people died after malfunction attributed to faulty sensors that pushed the nose down