sentences:  Despite this, two other airlines were to operate from Kildonan, including Dublin Air Ferries (DAF), which was run and owned by the noted aviator Lady Mary Heath and her husband, Jack Williams.In 1955 Pearse Cahill, Hugh Cahill's son, recognised an opportunity in the Irish Aviation market (Ireland had no major flying club, and no major secondary airline).Aer Lingus was also struggling to survive in the economic recessions of Ireland (which allowed for other enterprises to develop).