Shannon Airport is the only one of the five airports in the Republic to record an annualised drop in passengers this year.
CSO figures show Dublin and Cork Airports grew by 6.3% and 3.2%, respectively, in the first nine months of 2017 compared to the same period last year, while Shannon
decreased by 5.2% in the same period. Knock and Kerry grew by almost 2% each.
However Shannon had a substantial number of transit flights which are not included in the figures.
Dublin accounted for more than 60,500, or 82.5%, of all flights, while Cork handled just over 6,000 or 8.3% of all flights.