Alaska and United Airlines said Wednesday that they could resume service on their grounded Boeing 737 Max 9 aircraft within days, now that the Federal Aviation Administration has cleared airlines to begin formal inspections of the planes.

Alaska Airlines said it planned to bring its first Max 9s back into service Friday, completing the inspections over the next week. “Each of our aircraft will only return to service once the rigorous inspections are completed and each aircraft is deemed airworthy according to the FAA requirements,” the airline said in a statement Wednesday.

On an earnings call Thursday, Alaska executives said the company lost $150 million as a result of the grounding, and that all 65 of its 737 Max 9 jets would be back in service by the end of next week.

United, meanwhile, said it could have its Max 9 planes flying again by Sunday.

The FAA had grounded more than 100 jets after a Jan. 5 incident in which part of an Alaska Airlines plane flew off in midair, leaving a gaping hole in the fuselage. No passengers were seriously injured, but the accident has raised concerns about Boeing, its suppliers, and its quality-control processes.

The move comes even though federal investigators have not announced the exact cause of the Alaska Airlines incident. The National Transportation Safety Board is still investigating the accident, in which a portion of the aircraft known as a “door plug” fell off the jetliner shortly after the flight left Portland International Airport. The part was recovered and is currently being analyzed by NTSB investigators.

The airlines’ plan to quickly resume service came after the FAA approved a detailed set of instructions for the airlines to find and fix problems on the grounded planes. In preliminary inspections of the jets, United and Alaska said they discovered loose bolts.

“We grounded the Boeing 737-9 Max within hours of the incident over Portland and made clear this aircraft would not go back into service until it was safe,” FAA Administrator Michael Whitaker said in a statement. “The exhaustive, enhanced review our team completed after several weeks of information gathering gives me and the FAA confidence to proceed to the inspection and maintenance phase.”

The agency grounded 171 of the planes the day after the Alaska Airlines accident.

Whitaker also said the FAA will not allow Boeing to expand production of its Max jets until a thorough review of the company has been completed.

“This won’t be back to business as usual for Boeing,” he said. “We will not agree to any request from Boeing for an expansion in production or approve additional production lines for the 737 Max until we are satisfied that the quality control issues uncovered during this process are resolved.”

Boeing officials said in a statement Wednesday that they will “continue to cooperate fully and transparently with the FAA and follow their direction as we take action to strengthen safety and quality at Boeing. We will also work closely with our airline customers as they complete the required inspection procedures to safely return their 737-9 airplanes to service.”

The FAA’s announcement came just hours after David Calhoun, Boeing’s chief executive, wrapped up a series of meetings with lawmakers on Capitol Hill. Those he met included Sen. Maria Cantwell (D-Wash.), chair of the Commerce Committee, who said she plans to hold hearings into the matter, and Sen. Jerry Moran, R-Kan., whose state is home to one of Boeing’s major partners, Spirit AeroSystems.

Sen. Richard Blumenthal, D-Conn., said earlier Wednesday that he would not feel safe flying on the Max 9.

After the FAA’s announcement Wednesday evening, he said that he would want details of the inspection protocol along with confirmation that they had been carried out – and that he still had outstanding questions about the design of the door plug.

“The fact that there is a protocol is reassuring, but it has to be implemented,” Blumenthal said. “Until they’ve done the inspections, there’s a cause for concern about safety.”

The NTSB said one of its investigators will be returning to Boeing’s 737 factory in Renton, Wash., on Friday as part of the probe. Investigators are trying to build a timeline from the early stages of the production of the door plug to the accident.

United and Alaska Airlines, the only two U.S. carriers that have 737 Max 9 aircraft in their fleets – 79 and 65, respectively – have been forced to cancel flights as a result of the grounding order. On Thursday, Alaska Airlines said it had canceled 3,000 flights as a result of the Boeing 737 Max 9 grounding but was able to rebook about half of those customers affected to other flights.

In an interview with NBC News on Tuesday, Ben Minicucci, chief executive of Alaska Airlines, said he was “angry” with Boeing.

Scott Kirby, United’s chief executive, said this week the carrier expects to post a loss for the first quarter of 2024 as a result. Kirby also said the company was weighing alternative plans for future growth out of concern the accident would delay certification of a larger version of the plane, the Max 10.

Minicucci acknowledged that some travelers may be hesitant to fly on 737 Max 9 jets given the Jan. 5 accident, but he thought those concerns would pass.

“I think at first people will have some questions or some anxiety but I believe over time, people will get back on this airplane,” he said.

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