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Mona began life as what, by the end of WWI, was called RAF Llangefni. It was a base for non-rigid airships which, with Baldonell near Dublin, was responsible for anti-submarine patrols in the Irish Sea. In 1942, the old base became a training centre, first for air gunners and then for air observers. In 1943 concrete runways were built over an area extending to some 3 square kilometres. In 1946 Mona was declared redundant, but in 1951 it became a relief landing ground for neighbouring RAF Valley. It is used by RAF during the weekdays and in the evenings and at the weekends, since 1974, by the Mona Flying Club.

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