Singapore Airlines is ordering 30 more Airbus A350-900s and 30 Boeing 787-10Xs in deals valued at more than $17 billion.

The agreement with Airbus comprises 30 firm-ordered A350-900s for delivery from the 2016/17 financial year, plus options for 20 more. The options may be converted into orders for larger A350-1000s.

The Airbus order is the carrier’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-haul routes.

SIA’s arrangement with Boeing comprises 30 firm-ordered B787-10Xs for delivery from the 2018/19 financial year. It is conditional upon Boeing formally launching the B787-10X programme.

The B787-10Xs are intended for use on medium-range routes. The new orders lift to 126 the number of firm aircraft commitments SIA has with the two aircraft manufacturers.

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

“They demonstrate our commitment to the Singapore hub and our confidence in the future for premium full-service travel.”

He added: “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.”