STORY: Boeing looks set to resume delivering jets in China, after being hit by a regulatory probe.

Thats according to Reuters sources, who say widebody 777 and 787 planes will start getting to customers within days.

Deliveries of 737 MAX jets are expected to resume a little later.

Reuters first reported in May that Boeing had halted handing over new planes in the country.

That was while Chinese watchdogs reviewed concerns over batteries used in cockpit voice recorders.

The delays, combined with factory disruption, led Boeing to warn that second quarter cash burn could be worse than expected.

A filing at the end of last year showed Boeing had 85 MAX jets waiting for delivery to Chinese customers.

Around a quarter of those were subsequently delivered by the end of April.

Jet makers are largely paid on delivery of their planes, meaning cash flow takes a big hit if new aircraft are stuck at the factory.

Separately Thursday, U.S. watchdogs sanctioned Boeing for leaking details of an investigation into the midair blowout on a MAX jet in January.

Regulators said the firm had "blatantly violated" the rules, by giving confidential material to the media.

The National Transportation Safety Board said Boeing would no longer be granted access to information on the investigation.