In their biggest ever formation, 22 Typhoon jets spelt out the number "100" in the sky - an added surprise for the royals, personnel and the throngs of public spectators who had packed out the streets to watch.
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The tribute to the RAF, which became the world's first independent air force when it was founded as a separate entity from the British Army and Royal Navy in 1918, began with a service at Westminster Abbey.
Members of the royal family tilted their heads skyward on Tuesday afternoon as the Royal Air Force marked its centenary with a dramatic flypast across central London and over Buckingham Palace. She shared a memorable laugh with the Prince of Wales and Duchess of Cornwall at a Buckingham Palace garden party days after her wedding. Archbishop of Canterbury Justin Welby highlighted how members of his own family have served and been killed in the RAF - drawing attention to his own father who flew in Burma.
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Nearly 100 aircraft took part in the celebratory procession, including three new F35 Lightning stealth fighters, several military helicopters, and planes from the RAF Battle of Britain Memorial Flight (BBMF) including Spitfires and a Lancaster bomber.
Earlier, the royals and more than 2,200 people packed Westminster Abbey for a service also attended by Theresa May, defence secretary Gavin Williamson and Labour leader Jeremy Corbyn.
The Duchess of Cambridge is clad in an icy blue Alexander McQueen dress with three-quarter length sleeves and her signature neckline, which she's paired with a matching hat by Sean Barrett and nude heels.
Prince William - the Duke of Cambridge - is the most recent member of the family to qualify, receiving his RAF pilot's wings in 2008 and later qualifying as an operational captain with the RAF Search and Rescue Force.