Boeing’s 737 MAX has resumed passenger flights in the US with an American Airlines flight between Miami and New York.
Regulators grounded the plane in March 2019 following two separate deadly crashes within five months.
The Federal Aviation Administration (FAA) lifted the ban last month after Boeing agreed to new safeguards.
American Airlines’ flight on Tuesday showed its confidence in the safety of the 737 MAX.
“This is an aircraft that has been more highly scrutinised than any ever before. We’re very confident that this aircraft is the safest in the skies,” the airline’s president Robert Isom said before the flight’s departure.
American Airlines currently has 31 737 MAX aircraft, including seven which were delivered after the FAA lifted its safety ban in November.
The airline and aerospace giant Boeing have both sought to reassure the public over the plane’s safety, although polls suggest that might be difficult.
A Reuters/IPSOS poll shows that more than half of passengers are wary of taking the jet when reminded of two fatal crashes that led to the grounding.
Regulators initially pulled the plane from service after two catastrophic crashes killed 346 people.
Lion Air Flight 610 crashed after take-off from Jakarta in October 2018, while Ethiopian Airlines Flight 302 crashed after take-off from Addis Ababa airport in March 2019.
Before the 737 Max was cleared to fly again, Boeing updated flight control software, revised crew procedures and rerouted internal wiring.
Although the FAA has already lifted its ban, the European Union Aviation Safety Agency isn’t expected to clear the plane to fly until January.
American Airlines is the third carrier globally to resume flights following Brazilian low-cost carrier Gol Linhas Aereas Inteligentes and Grupo Aeromexico earlier this month.
A smooth return to service could be vital for Boeing, which announced its fourth straight quarterly loss in October, along with deeper job cuts.
The 737 MAX issue saw annual orders drop to their lowest level in two decades.
Boeing’s problems have also been compounded by the Covid-19 pandemic, which has affected both airlines and manufacturers.
The International Air Transport Association predicts global passenger traffic will not return to pre-pandemic levels until 2024.