Alaska Airlines has begun flying Boeing 737 Max 9 jetliners again for the first time since they were grounded after a panel blew out of the side of one of the airline’s planes.

The airline said in a statement that it has completed its final inspection of their group of the aircraft. They said they resumed flying the Max 9 with a flight from Seattle to San Diego on Friday afternoon.

On Wednesday, the Federal Aviation Administration approved the inspection and maintenance process to return the planes to flying. Technicians at Alaska began inspections that night, the airline said.

The airline said they expect inspections to be completed by the end of next week, allowing the airline to operate a full flight schedule. Inspections are expected to take up to 12 hours per aircraft.

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“Each of our 737-9 MAX will return to service only after the rigorous inspections are completed and each plane is deemed airworthy according to FAA requirements,” the airline said in a written statement Friday.

United aims to follow suit on Sunday, but a spokeswoman said the airline might use them as spare planes Friday or Saturday.

Alaka Airlines and United are the only two U.S. airlines that operate this particular model of the Boeing 737.

The Federal Aviation Administration has detailed the process that airlines must follow to inspect — and if necessary, repair — the panels called door plugs, one of which broke loose on Alaska Airlines flight 1282 on Jan. 5.

The plugs are used to seal holes left for extra doors on the Max 9 when an unusually high number of seats requires more exits for safety reasons.

Alaska Airlines grounded all 65 of its Max 9 jets within hours after one of the two door plugs in the back half of the cabin of flight 1282 blew away while 16,000 feet (about 4,900 meters) above Oregon. The FAA grounded all Max 9s in the U.S. the day after the blowout.

No passengers were seriously injured.

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