Anyone travelling to Dublin Airport on Wednesday or Friday is being advised to allow themselves extra time due to US President Joe Biden's visit to Ireland.
Mr Biden will arrive in Belfast on Tuesday as part of his four day trip to Ireland, north and south, to mark the 25th anniversary of the Good Friday Agreement.
He will spend less than 24 hours in Belfast, before travelling to Dublin Airport on Air Force One on Wednesday afternoon.
Read more: : Details on Joe Biden's Belfast visit as NI prepares to welcome US President
Ahead of the visit, the PSNI said airport traffic at Belfast International will be affected as Mr Biden is due to fly in to Northern Ireland on Tuesday night. Those using Belfast International Airport have been advised to allow extra time for travel.
Meanwhile in fresh advice on Monday evening, gardai warned passengers that there could be delays on the roads entering Dublin Airport.
Similar advice was also issued to those travelling to Knock Airport on Friday, where Mr Biden will arrive and depart as part of his trip to his ancestral home in Ballina.
They said: "The 46th President of the United States of America [Mr Biden] will arrive and depart at Dublin Airport, at various times over the course of the 4-day visit.
"Normal operations will continue at Dublin Airport at all times, however travelling members of the public should allow additional time to arrive at the airport due to possible rolling road closures, particularly late Wednesday and early Friday.
"The 46th President of the United States of America will arrive and depart at Ireland West Airport, on the afternoon and evening of Friday 14th April 2023.
"Normal operations will continue at Ireland West Airport at all times, however travelling members of the public should allow additional time to arrive at the airport due to possible rolling road closures."
Gardai said that "traffic restrictions for the visit will be kept to the minimum required" and it is intended to keep any impact "localised and minimal".
Mr Biden will travel to Belfast on Tuesday evening, where he will meet UK Prime Minister Rishi Sunak. He will open the University of Ulster campus on Wednesday morning, before travelling to Dublin on Air Force One.
From Dublin, he will take a helicopter to Co Louth to visit family in Dundalk and Cooley.
Thursday will be a day of political engagements, with a visit to Irish President Michael D Higgins in Aras an Uachtarain, an engagement in Farmleigh with Taoiseach Leo Varadkar and an address to the Dail. A banquet will be held in Dublin Castle that evening.
On Friday, Mr Biden will travel to Ballina, Co Mayo, the hometown of his great-great-grandfather Patrick Blewitt where he will give a public address outside St Muredach's Cathedral before returning to the US that evening.
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