SINGAPORE Airlines (SIA) has finalised a US$13.8 billion order for 39 Boeing aircraft in an agreement that was first announced in February this year. On Tuesday, the airline said in a Singapore Exchange filing that a firm order with Boeing for 20 777-9s and 19 787-10s was confirmed for "additional growth and fleet modernisation through the next decade". The signing took place on Oct 23 (US time) at the White House in Washington DC, at a ceremony witnessed by US President Donald Trump and Singapore Prime Minister Lee Hsien Loong as part of his six-day official working visit to the US. SIA CEO Goh Choon Phong said: "These new aircraft will also provide the SIA Group with new growth opportunities, allowing us to expand our network and offer even more travel options for our customers." Besides the 39 orders, the purchase agreement comprises six options for each aircraft type, which if exercised will enlarge the deal to as many as 51 aircraft, SIA said.