Europe's Airbus lost a major order on Wednesday when Dubai's Emirates airline cancelled its entire purchase of 70 Airbus A350 jets, dealing an unexpected blow to the planemaker and engine maker Rolls-Royce.
The decision cuts the order book for the European company's newest jet, which is due to enter service in around six months' time, by around 10 percent.
Airbus said it followed a "fleet requirement review" as Emirates shifts towards the large A380 superjumbo, for which it is the biggest customer.
Emirates was among the first buyers for the A350 rival model to Boeing's 787 Dreamliner when it placed the order for 50 A350-900 and 20 A350-1000 jets in 2007.
The deal was worth around $16 billion at 2007 list prices - or close to $22 billion based on the current catalogue - although launch customers typically negotiate discounts.
Emirates was due to start taking deliveries of the A350 in 2019. The first A350 is due to be delivered to Qatar Airways in the fourth quarter of this year.
"We are confident that we will sell the (production) slots in the coming months," an Airbus spokesman said. "There's no impact on the program as deliveries were scheduled to start at the end of the decade."
Airbus shares were down 3.3 pct in early trading in Frankfurt, with the news expected to cast a shadow over two days of briefings for the media at Airbus' headquarters in Toulouse on Wednesday and Thursday.
Emirates has been pushing for Airbus to upgrade the A380 superjumbo with a more efficient engine, after increasing its total orders for the world's biggest passenger jet by 50 in November to 140 planes.
The carrier's chief executive, Tim Clark, said earlier this month that a revamped A380 could have a 10-12 percent performance improvement and that "we are hoping to move on that pretty soon".
Emirates is also in the process of firming up an order for 150 of Boeing's latest jetliner, the 777X mini-jumbo, of which Emirates has ordered 150 worth $76 billion at list prices.
Asked about the A350 order cancellation on Wednesday, an Emirates spokesman said: "The contract which we signed in 2007 for 70 A350 aircraft has lapsed. We are reviewing our fleet requirements."
Airbus said in a statement that it remained "very confident" in the A350 program and that it expected the A350 order book to grow in 2014.
Britain's Rolls-Royce, which is the sole engine maker for the A350, said the Emirates decision would result in a 2.6 billion pound ($4.4 billion) hit to its order book.
"While disappointed with this decision, we are confident that the delivery slots which start towards the end of this decade vacated by Emirates will be taken up by other airlines," Rolls-Royce said in a statement.