The Red Arrows fly over Buckingham Palace during a celebration to mark the 100th anniversary of the Royal Air Force (RAF) in London, Britain on July 10, 2018. (Xinhua/Britain's Ministry of Defence)
The Royal Air Force (RAF) personnel stand in an "RAF 100" formation during a celebration to mark the 100th anniversary of the Royal Air Force (RAF) in London, Britain on July 10, 2018. (Xinhua/Britain's Ministry of Defence)
The Red Arrows fly over central London during a celebration to mark the 100th anniversary of the Royal Air Force (RAF) in London, Britain on July 10, 2018. (Xinhua/Britain's Ministry of Defence)
Britain's Queen Elizabeth II attends a service at Westminster Abbey to mark the 100th anniversary of the Royal Air Force (RAF) in London, Britain on July 10, 2018. (Xinhua/Ray Tang)
Typhoon aircrafts fly in a "100" formation during a celebration to mark the 100th anniversary of the Royal Air Force (RAF) in London, Britain on July 10, 2018. (Xinhua/Britain's Ministry of Defence)
The Royal Air Force (RAF) Pipes and Drums band take part in a parade to mark the 100th anniversary of RAF in London, Britain on July 10, 2018. (Xinhua/Britain's Ministry of Defence)
Britain's Prince William (3rd L), Duke of Cambridge, and his wife Catherine (2nd L), Duchess of Cambridge, Prince Harry (5th L), Duke of Sussex and his wife Meghan (4th L), Duchess of Sussex, attend a service at Westminster Abbey to mark the 100th anniversary of the Royal Air Force (RAF) in London, Britain on July 10, 2018. (Xinhua/Ray Tang)
Britain's Prince Charles (L, front), Prince of Wales, and his wife Camilla (R, front), Duchess of Cornwall, attend a service at Westminster Abbey to mark the 100th anniversary of the Royal Air Force (RAF) in London, Britain on July 10, 2018. (Xinhua/Ray Tang)
