The US Department of Homeland Security is to boost the numbers of staff at its Customs and Border Protection (CBP) facility at Dublin Airport.
The move will enable all transatlantic Aer Lingus passengers to clear immigration before arriving in the US.
At the moment, passengers from as many as 15 Aer Lingus flights a week are unable to clear US immigration in Dublin due to a staff shortage at the facility
The CPB operates another facility in Shannon, and the two operations are currently the only such pre-clearance sites in the world, outside of Canada and the Caribbean.
The pre-clearance allows fliers to land in the US as domestic passengers, enabling them to avoid lengthy immigration queues on arrival .
The deployment of the additional personnel comes on the back of an influx of tourists from the US thanks to the Gathering this year.
This year is expected to be the busiest ever for transatlantic traffic at Dublin Airport. The previous record was in 2008, when it hit 1.75m transatlantic passengers.
Between January and August this year almost 1.3 million transatlantic passengers had used the airport.
That was 14pc higher than in the corresponding period in 2012.