Singapore Airlines has reduced its existing A350-900 order by seven aircraft.
The carrier's A350 backlog now consists of 63 aircraft, down from 70, with purchase options for a further 20.
The order adjustment was made following a request by Airbus, the reason for which has not been made public.
An Airbus spokesperson told our sister publication Business Traveller Asia-Pacific: "We confirm that at our request Singapore Airlines has released seven A350 delivery slots back to Airbus. These have already been offered and allocated to another airline."
Delivery of SIA's first A350 at the end of this year will not be affected and the order reduction will not affect the airline's fleet renewal or growth plans, the carrier said.
Instead, plans have been made to bring forward the deliveries of other A350-900s, while SIA also maintains extension options on several of its leased A330-300s.
SIA's financial position remains healthy, with the group reporting an operational profit of S$111 million (£52 million) in the April–June 2015 quarter – S$72 million (£36 million) higher than the same period last year.
SIA recently unveiled a special livery celebrating the nation's Golden Jubilee that will feature on two A380s until the end of the year (see news, May 28).