FRANKFURT, Germany: In the latest round of their decades-long battle for dominance in commercial aircraft, Europe's Airbus established a clear sales lead over Boeing even before the American company encountered more fallout from manufacturing problems and ongoing safety concerns.

Airbus has outpaced Boeing for five straight years in plane orders and deliveries and just reported a 28 percent quarterly increase in net profit. It was already winning market share by beating Boeing to develop a line of fuel-efficient, mid-sized aircraft that are cheaper for airlines to fly.

And now Boeing is facing a government-mandated production cap on its best-selling plane.

Yet the European company is unlikely to extend its advantage in the Airbus-Boeing duopoly much further despite having customers clamoring for more commercial aircraft, according to aviation analysts. The reason: Airbus already is making planes as fast as it can and has a backlog of more than 8,600 orders to fill.

Its ability to leverage Boeing's troubles therefore is "very limited," according to Jonathan Berger, managing director at Alton Aviation Consultancy.

Between strained supply chains and the long lead times for a hugely complex and highly regulated product, a jetliner ordered from Airbus today may not arrive until the end of the decade.

Boeing also has a huge order backlog for more than 5,660 commercial planes. The mismatch between the post-Covid demand for flights and the aircraft supply pipeline is bad news for travelers as well as airlines.

"This has been an incredibly strong market recovery, and people need more jets than they're getting," said Richard Aboulafia, a managing director at AeroDynamic Advisory.

At the beginning of the year, Boeing seemed finally to be recovering from two crashes of Max jets in 2018 and 2019 that killed 346 people in Indonesia and Ethiopia. Then, on January 5, a door plug blew out of an Alaska Airlines 737 Max 9, and the company has been reeling ever since.

Boeing has since slowed manufacturing at the order of the US Federal Aviation Administration. It lost $355 million in the first quarter because of a decline in aircraft deliveries and compensation it paid to airlines for a temporary grounding of Max 9s. The Max was Boeing's answer to Airbus' A320 family of planes.

Airbus is taking a conspicuously cautious and even modest stance toward its recent success and its rival's woes.

CEO Guillaume Faury has said he is "not happy" about Boeing's troubles, and they are not good for the industry as a whole.

In an April 25 call with journalists, Faury was reserved about how much the company could speed up production, even with 8.7 billion euros in cash on hand.

Airbus was managing "a diversity of challenges" in getting the parts it needs, he said, and must "make sure that we ramp up at a pace that is compatible with the weakest suppliers."

Faury stressed that any moves to expand production would be done with an eye to "our core pillars of safety, quality, integrity, compliance and security."

Airbus and Boeing have manufacturing constraints in part because the two companies are not so much aircraft makers as "aircraft assemblers" that rely on thousands of parts made by other companies, from the fuselage and engines to electronics and interiors, Berger noted.

Since "the supply chains are going as fast as they can," Airbus is not in a position to swoop in and take Boeing's customers.