Boeing expects supply chain problems to persist almost until the end of 2023, led by labour shortages at mid-tier and smaller suppliers, partly due to the faster than expected return of demand, its chief executive said today.

Boeing said last month that production of its 737 aircraft had been slowed by shortages of a single type of wiring connector.

Some of its airline customers had also been forced to cancel flights due to a lack of staff in the post-pandemic recovery.

"The shift from demand to now supply issues is remarkable, the speed with which it happened," Boeing chief executive David Calhoun said at Bloomberg's Qatar Economic Forum in Doha.

He said Boeing had a big, complicated supply chain with lots of fragility in it, leading to problems when there were delays.

"It's been a real issue for both manufacturers and will probably stay that way in my view almost to the end of next year," Calhoun said.

"And the biggest restraint of all for that mid-tier set of suppliers and sub-tier set of suppliers is labour availability, do we have a workforce," he said.

Reuters last month reported engine maker CFM International, a joint venture between GE and Safran, was facing industrial delays of six to eight weeks in the wake of supply-chain problems.

Airbus last month said it saw growing short-term risks in its supply chain but voiced confidence that its global network of suppliers would be able to keep up.