A Boeing 737 MAX 7 aircraft lands during an evaluation flight at Boeing Field in Seattle, Washington, US September 30, 2020. (Photo:Agencies)

The first US commercial flight of a Boeing 737 MAX since its worldwide grounding nearly two years ago took off from Miami on Tuesday.

American Airlines flight 718 departed for New York's La Guardia airport around 1544 GMT, marking the jet's return to service after two deadly crashes led to 346 deaths and plunged Boeing into crisis.