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Boeing 737 Max 9 jetliners are returning to service after a temporary grounding due to a midair incident earlier this month.

Alaska Airlines initiated the resumption of commercial flights with these aircraft on Friday, starting with a flight from Seattle to San Diego. The airline assured that the planes are returning to operation only after completing extensive inspections and meeting the Federal Aviation Administration’s airworthiness criteria.

This comes after the FAA outlined the procedure for bringing the Boeing 737 Max 9 jets back into service, endorsing a detailed inspection and maintenance process for each of the 171 grounded aircraft. The grounding decision followed an emergency landing necessitated by a door plug blowout on an Alaska Airlines flight. Alaska Airlines anticipates having all its grounded aircraft ready by month’s end, allowing for the full operation of its flight schedule. The airline is also accommodating customers hesitant to fly on the 737 Max 9, offering to rebook them on different aircraft.

Boeing Commercial Airplanes’ president and CEO, Stan Deal, communicated to employees the company’s commitment to enhancing quality and regaining trust. “Our long-term focus is on improving our quality so that we can regain the confidence of our customers, our regulator, and the flying public,” Deal stated, acknowledging past disappointments and expressing regret for the inconvenience caused to customers.

United Airlines, the only other airline besides Alaska Airlines to operate the 737 Max 9, also resumed flights with the aircraft. Their first passenger flight since the grounding took off on Saturday morning from Newark, N.J., to Las Vegas.