The questions concern the inspection method for new planes following production problems that led to an earlier pause in deliveries. With approval from the Federal Aviation Administration (FAA), Boeing had resumed deliveries of the widebody Dreamliner in March after a five-month halt.

"Boeing still needs to show that its proposed inspection method would meet FAA's federal safety regulations," the agency said. "The FAA is waiting for additional data from Boeing before determining whether the company's solution meets safety regulations.

"Since the FAA has not approved Boeing's proposal, Boeing chose to temporarily stop deliveries to its customers."

A Boeing spokesperson said there was no impact on 787 planes already in service.

"We are working to provide the FAA with additional information concerning the analysis and documentation associated with the verification work on undelivered 787s," a Boeing spokesperson said.

"We continue to work closely with the FAA in a transparent and timely manner."

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