The Port of Portland,which operates the airport,told KPTV that the fire department treated minor injuries at the scene. One person was taken for more treatment,but wasn’t seriously hurt.

Flight 1282 had taken off from Portland at 5.07pm on Friday for a two-hour flight to Ontario,California. About six minutes later,the window and a chunk of the fuselage blew out as the plane was at about 16,000 feet (4.8 kilometres). One of the pilots declared an emergency and asked for clearance to descend to 10,000 feet (3 kilometres),the altitude at which there is enough oxygen to breathe safely.

“We need to turn back to Portland,” the pilot told controllers in a calm voice that she maintained throughout the landing process.

Videos posted by passengers online showed a gaping hole where the window had been and passengers wearing their masks. They applauded when the plane landed safely about 13 minutes after the window blew out. Firefighters then came down the aisle,asking passengers to remain in their seats as they treated the injured.

The aircraft involved rolled off the assembly line and received its certification just two months ago,according to online FAA records. The plane had been on 145 flights since entering commercial service on November 11,said FlightRadar24,another tracking service. The flight from Portland was the aircraft’s third of the day.

The Max is the newest version of Boeing’s venerable 737,a twin-engine,single-aisle plane. The plane went into service in May 2017.

The union representing flight attendants at 19 airlines,including Alaska Airlines,commended the crew for keeping passengers safe.

“Flight Attendants are trained for emergencies and we work every flight for aviation safety first and foremost,” the Association of Flight Attendants said in a statement Saturday.

Two Max 8 jets crashed in 2018 and 2019,killing 346 people and leading to a near two-year worldwide grounding of all Max 8 and Max 9 planes. The planes returned to service only after Boeing made changes to an automated flight control system implicated in the crashes.

Last year,the FAA told pilots to limit use of an anti-ice system on the Max in dry conditions because of concern that inlets around the engines could overheat and break away,possibly striking the plane.

Max deliveries have been interrupted at times to fix manufacturing flaws. The company told airlines in December to inspect the planes for a possible loose bolt in the rudder-control system.

Reuters

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