Singapore Airlines has ordered 30 Airbus A350-900s and 30 Boeing 787-10Xs aircraft at an estimated cost of S$21.47 billion. The Airbus deal includes an option to purchase 20 additional aircraft and an option to convert the orders for bigger A350-1000s. Airbus will begin the delivery of aircraft from 2016–17, while Boeing will begin the delivery from 2018–19.