Singapore Airlines has become the first carrier to place an order for Boeing’s 787-10X jet, it was revealed today.

The airline has ordered 30 of the “stretched” Dreamliners for delivery in the 2018-19 financial year. The deal is conditional upon Boeing formally launching the B787-10X programme.

SIA has also agreed to purchase 30 more Airbus A350-900s for delivery in the 2016-17 financial year.

That deal includes options for 20 more, options which may be converted into orders for larger A350-1000s.

The combined value of the two deals is more than $17 billion.

Goh Choon Phong, Singapore Airlines CEO, said: “Today’s aircraft orders are among the biggest in Singapore Airlines’ history, helping to ensure that we retain our industry leading position.

“These new aircraft will provide opportunities to grow and renew our fleet and enhance our network, benefiting customers by offering more travel options and the latest in-flight cabin products.”

Rolls-Royce’s Trent XWB is the sole engine type for the A350-900. An engine selection for the B787-10Xs will be made at a later date.

The agreement with Airbus is SIA’s third for A350-900s, lifting to 70 the number of firm orders in place for the aircraft type. They are intended for use on medium and long-range routes.

The B787-10Xs are intended for use on medium-range routes.

The new orders will lift to 126 the number of firm aircraft commitments SIA has in place with Airbus and Boeing.

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