PARIS, May 20 (Reuters) - Europe's Airbus has informed some customers of more delays to deliveries of some A350 jets scheduled for later this decade, raising fresh concerns over shipments from a factory acquired in the United States, three industry sources said.

The sources said the delays stemmed mainly from problems in securing shipments from the former Spirit AeroSystems plant in Kinston, North Carolina, and that cargo doors built by Airbus in Spain for a new A350 freighter model also faced some disruption.

Airbus said it never commented on delivery timelines and that the first flight and the first delivery of the upcoming A350 freighter both remained on schedule.

(Reporting by Tim Hepher; Editing by Alex Richardson)