Boeing hoped 2024 can be the 12 months it might considerably enhance manufacturing of its common Max jets. However lower than a month into the 12 months, the corporate is struggling to reassure airline prospects that it’s going to nonetheless be capable to ship on its guarantees.

That’s as a result of the Federal Aviation Administration stated on Wednesday that it might restrict the aircraft maker’s output till it was assured in Boeing’s high quality management practices. On Jan. 5, a panel blew off a Boeing 737 Max 9 physique shortly after takeoff, terrifying passengers on an Alaska Airways flight and forcing the pilots to make an emergency touchdown at Portland Worldwide Airport in Oregon. Nearly instantly, the F.A.A. grounded some Max 9s.

Since then, particulars have emerged in regards to the jet’s manufacturing at Boeing’s facility in Renton, Wash., which have intensified scrutiny of the corporate’s high quality management. Boeing employees opened after which reinstalled the panel a couple of month earlier than the aircraft was delivered to Alaska Airways.

The directive is one other setback for Boeing, which had been planning to extend manufacturing of its Max aircraft collection to greater than 500 this 12 months, from about 400 final 12 months. It additionally deliberate so as to add one other meeting line at a manufacturing facility in Everett, Wash., a significant Boeing manufacturing hub north of Seattle.

As a part of the F.A.A.’s announcement on Wednesday, it additionally accredited inspection and upkeep procedures for the Max 9. Airways can return the jets to service as soon as they’ve adopted these directions. United Airways stated on Thursday that it may resume flying a few of these planes as quickly as Friday.

The transfer is one other potential blow to airways. Although demand for flights got here roaring again after pandemic lockdowns and journey restrictions eased, the airways haven’t been capable of take full benefit of that demand. The businesses haven’t been capable of purchase sufficient planes or rent sufficient pilots, flight attendants and different employees they should function flights. A surge in the price of jet gas after Russia invaded Ukraine additionally harm income.

Many airline executives are actually assessing how the F.A.A. order would have an effect on plans for his or her fleets for the following decade — or longer.

Once they had been launched, the narrow-body, fuel-efficient planes had been supposed to assist the producer compete with Airbus, which has pulled approach forward of Boeing in gross sales. However the Max collection has been stricken by mechanical and questions of safety, together with two crashes in 2018 and 2019 that killed almost 350 folks and led to the grounding of the Max 8 for almost two years.

In its Wednesday announcement, the F.A.A. didn’t say how shortly it might raise the pause on the manufacturing enhance, as a substitute giving Boeing circumstances it should meet earlier than doing so. It stated it “gained’t be again to enterprise as typical for Boeing.”

“We won’t comply with any request from Boeing for an enlargement in manufacturing or approve extra manufacturing traces for the 737 Max till we’re glad that the standard management points uncovered throughout this course of are resolved,” stated Mike Whitaker, the company’s administrator.

Boeing’s share worth fell about 6 % on Thursday and is down about 19 % since Jan. 5.

In 2023, Boeing produced round 32 of its 737 planes monthly on common, with plans to ramp as much as 38 by the tip of final 12 months. It had aimed to additional step up manufacturing to 42 monthly in 2024, a year-over-year enhance of greater than 100 planes, and to about 50 monthly in 2025. Earlier than the Max 8 was grounded in 2019, Boeing had been producing 52 Max jets a month.

Many airways stated they welcomed the F.A.A.’s resolution to maintain a lid on Boeing’s manufacturing till regulators had been satisfied the corporate had improved high quality and addressed security issues. However some airline executives additionally moved shortly to rejigger their fleet plans below the idea that planes that that they had been anticipating would now come months or, in some instances, years later than that they had anticipated them.

Alaska Airways, which has a fleet of 231 Boeing 737 airplanes, was set so as to add 23 Max jets to its fleet in 2024 however stated Thursday that it anticipated “lots of these to get delayed.”

“We’ve got the appropriate variety of plane to fly our present schedule and get our visitors to the place they wish to go,” the corporate stated in an announcement. “We’re nonetheless working to know the implications of the F.A.A.’s just lately introduced limitation of plane manufacturing at Boeing.”

Southwest Airways, which was ready on greater than 500 Max jets as of October, stated it might “scale back the variety of Boeing 737 Max plane deliveries” it anticipated from the producer and now not anticipated any Max 7 jets, which the F.A.A. hasn’t licensed but, in 2024.

Nonetheless, some analysts stated it was not clear simply how a lot of an influence the F.A.A.’s order would have.

“It’s potential that the F.A.A.’s restriction on the ramp is irrelevant — a minimum of for the transfer to 42 — since traders had already begun to imagine an extended time at 38 to drive stability and elevated high quality,” analysts at Deutsche Financial institution stated in a analysis notice on Thursday, referring to the variety of 737 Max planes that Boeing makes in a month.

Not less than one airline was assured the disruptions wouldn’t harm its orders from Boeing. Ryanair, the European low-cost airline, stated in an announcement that the producer had “assured Ryanair that the grounding of the Max 9s and sustaining relatively than rising present month-to-month manufacturing won’t additional delay Ryanair deliveries” for summer time 2024 and summer time 2025.

Whereas the F.A.A.’s resolution to restrict manufacturing doesn’t assist, Boeing was additionally struggling to extend manufacturing for one more motive — it and its suppliers haven’t been capable of exchange all the employees who had been laid off, retired or stop in the course of the pandemic. Discovering new expert employees has been onerous, and it’s taking longer to coach them, stated Christopher Raite, a senior analyst at Third Bridge, a analysis agency. “The labor base simply isn’t there.”

Boeing has two fashions of Max planes in manufacturing, the Max 8 and Max 9, and two different variations, the Max 7 and Max 10, that are awaiting approval from the F.A.A. earlier than any will be flown.

Even earlier than the Jan. 5 incident on the Alaska Airways Max 9, airways had been restricted in how a lot they may develop by including flights or routes. In April, the president of the Worldwide Air Transport Authority, Willie Walsh, stated capability would stay diminished till 2025 and probably longer.

Jonnathan Handshoe, an airline analyst for CFRA Analysis, stated Boeing’s security and manufacturing struggles may worsen a precarious scenario for the airways.

Delays in new plane deliveries, Mr. Handshoe stated, would imply airways will spend extra on gas than they had been anticipating as a result of they are going to be pressured to make use of older, much less fuel-efficient planes that that they had hoped to scrap or promote. Along with elevated supply-chain points, Mr. Handshoe stated, new labor agreements grant pilots, flight attendants, mechanics and different employees massive raises.

In current weeks, some airline chiefs have taken the bizarre step of publicly chastising Boeing for its security failures and manufacturing delays. Hubert Horan, an aviation analyst, stated airways had been making an attempt to get a greater deal from Boeing on giant orders that they had already positioned.

“There are usually provisions in contracts like these for main penalties and cancellation if main issues forestall Boeing from fulfilling the contract,” Mr. Horan stated. “Partly, the current public statements are a part of the negotiation about closing phrases of penalties and reductions.”

On a name with analysts on Thursday, Alaska’s chief govt, Ben Minicucci, stated the corporate’s partnership with Boeing was a key a part of the service’s future. The corporate had 185 Max planes on order, and Mr. Minicucci famous that it had been pleased with the Max till the most recent incident.

However the weekslong grounding of Max 9 planes and the restrict on Boeing’s manufacturing will harm corporations like Alaska. The corporate stated it anticipated that the F.A.A.’s grounding alone would value it $150 million — although it additionally anticipated to be “made complete” for that loss — and Mr. Minicucci had stated in a current interview that he was offended with Boeing for its security and manufacturing failures.

“We’re going to carry Boeing’s ft to the hearth to verify we get good airplanes out of that manufacturing facility,” Mr. Minicucci stated.