The CSO is reporting a 4% drop in the number of passengers at Shannon Airport at the beginning of this year.
272,000 people flew through the Airport between January and March, down from 283,000 last year.
The 2017 figure is higher than in 2015, however, and traffic is expected to pick up greatly into the summer when holiday routes come on board, and when new routes from the likes of Lufthansa, SAS and Norwegian Air International get up and running.
There were slightly more departures than arrivals, while there were over 2,500 flights at Shannon in this time.
London was the most popular destination, with Heathrow, Stansted and Gatwick the three most busiest destinations, followed by Newark, Manchester, Boston and then the Polish Airports of Krakow, Wroclaw and Wasaw.
The Airport handled 3,100 tonnes of freight