sentences:  When Hugh Cahill started an aviation wing of his motor company - Iona - at Cross Guns Bridge in Dublin in 1931, he was already well known as a Dublin entrepreneur.Initially the Irish Government did not back the proposal for a civil aerodrome, and refused to allow Cahill a licence.It was not until after a few months in operation, when Iona National Airways flights became frequent and after Baldonnel was no longer seen as a location for civil aviation, that the licence was granted.