On the 10th of July 2018, The Duke and Duchess of Cambridge attended, celebrations for one hundred years of the RAF. The Duke was an RAF pilot. in 2010, he joined C flight 22 Squadron at RAF Valley in Anglesey. Close to the RAF Valley, the Duke and Duchess had their first home as a married couple in Angelsey.
The celebrations started with a service in Westminster Abbey. Originally, only the Duke with other members of the royal family would attend, as the Duchess is still on maternity leave. Before the service, The duke and duchess of Cambridge, along with the duke and duchess of Sussex, met with RAF personnel.
After the service, Their Royal Highness’s left Westminster Abbey ad returned to Buckingham Palace (a route The duke and duchess have taken many times since their carriage procession after their wedding in 2011).
Before the flypast, The Queen presented the RAF, with their new colours. The duke and duchess watched this event from the forecourt of Buckingham Palace. After the presentation, The royal family headed back inside for the flypast. A special treat for the photographers and people watching from outside the gates, was in the form of Prince George and Princess Charlotte, watching the flypast from one of the windows in the Palace.
After the flypast the Duke attended a reception in Buckingham Palace. I assume the Duchess left the Palace with Prince George and Princess Charlotte.