Boeing 787 program chief Scott Fancher said Friday deliveries of completed Dreamliner sections to Everett, Wash., would be slowed during September, The Seattle Times reported.
The slowdown is not linked to a problem with 787 horizontal tails, the Times said.
The September production slowdown surprised some observers.
Fancher told journalists in a teleconference Friday the delivery schedule had changed some because some early customers had requested later delivery.
The undisclosed total of planned deliveries in 2010 and 2011 will be unaffected, he said.
Fancher said Boeing customers eager to get their more fuel-efficient planes won't be let down.
"I don't think we are going to be disappointing anybody with the deliveries, but there are always subtleties we have to work out with our customers," Fancher said.