Boeing will delay the first flight and delivery of its new 787 Dreamliner aircraft.
The flight was due to take place on 30 June, but the company said it has been delayed because of a need to reinforce a side section of the plane.
First deliveries will be put back further because of the delays.
Boeing said it would not now issue new dates for the first flight and deliveries for several weeks.
The BBC reports the long-range, medium-sized Dreamliner is already more than two years behind schedule.
Boeing has received 865 orders for the Dreamliner, which is the company's first completely new aircraft since 1995.
Meanwhile, Airbus has officially delivered its first Chinese-made plane.
The aircraft, a A320 mid-range model, has been delivered to a leasing firm and will be used by Sichuan Airlines.
Boeing makes components in China, but Airbus has a full production facility there.
