SINGAPORE — Airbus said it is looking to add another assembly line for its new A350 wide-body jet, a competitor to Boeing’s troubled 787 Dreamliner, to meet rising demand for the plane’s largest version.

With more than 600 orders placed for the A350, due for its first flight this summer before deliveries begin in the second half of 2014, Airbus is looking at adding capacity for the -1000 variant, said John ­Leahy, chief operating officer for Airbus.