Members of the IX (B) Squadron, based at RAF Marham, have celebrated its centenary this week.
The squadron was formed in the French town of St Omer, then the headquarters of the Royal Flying Corps, on December 8, 1914.
Squadron leaders and other senior RAF personnel attended a ceremony there on Monday, which included a flypast by a Tornado from Marham.
They then travelled to the Mendinghem Military Cemetery, Poperinge, where crosses were laid on the graves of 22 Royal Flying Corps servicemen killed during the First World War, before leading the nightly remembrance service at the Menin Gate in Ypres.
Wreaths were laid by Tornado force commander, Air Commodore Dave Waddington, Air Commodore Spike Milligan, chairman of the IX Squadron Association, and squadron leader, Wing Commander Chris Snaith, who said the commemorations were “an amazing experience.”
He added: “To stand on the very spot where this squadron was formed exactly 100 years ago and remember those brave souls that have served and given their lives for our country was very emotional.”