Boeing’s 737 Max 9 model returned to service Friday afternoon when Alaska Airlines flight 1146 departed Seattle at approximately 3:51pm local time (6:51pm ET) bound for San Diego.

It is the first revenue flight for this model since the Federal Aviation Administration grounded the Boeing jets three weeks ago following a door plug blowout on Alaska Airlines flight 1282.

Alaska Airlines COO Constance von Muehlen took the flight and sat in the seat next to the door plug, telling CNN she has full confidence in the aircraft.