The US president's aircraft landed shortly after 8.20am on Saturday, bringing Trump and members of his family to Ireland for a two-day trip that will combine official meetings in Dublin with a visit to his golf resort in Doonbeg.
The aircraft carrying Trump is itself part of a story that has followed the president internationally.
The Boeing 747-8 was gifted by Qatar's royal family and has been retrofitted for use as a presidential aircraft. Trump has described the jet in glowing terms, but its temporary role has also attracted scrutiny over its security capabilities.
The aircraft is being used while new Boeing jets intended for the US presidential fleet continue to face delays. Trump has said the gifted aircraft will eventually be taken out of service for additional security upgrades.
Its appearance over Dublin was closely watched, with people gathering near the airport from the early morning to catch sight of the presidential plane as it came in to land.
Once on the ground, Trump was greeted by Tánaiste Simon Harris, who spoke of the importance of the relationship between Ireland and the United States.
Mr Harris said he and Trump exchanged a few words after the aircraft arrived and that the president was looking forward to travelling to Doonbeg.
Trump's schedule will take him from Dublin Airport to Áras an Uachtaráin, where he is due to meet President Catherine Connolly, followed by an engagement with Taoiseach Micheál Martin at Farmleigh. He is also scheduled to attend events at Deerfield, the US ambassador's residence.
The presidential visit has required a significant security response. Gardaí have prepared for Trump's movements through Dublin and later in Co Clare, with road closures and restrictions expected in several areas.
Protests have also been planned, while Garda Commissioner Justin Kelly has said peaceful demonstrations will be facilitated but warned that there would be no tolerance for public disorder or attempts to interfere with the president's movements.
For now, though, the focus is on the aircraft that brought the US president to Ireland.
With Air Force One safely on the ground at Dublin Airport, Trump's Irish visit is officially under way, with the next stop being the country's political centre before the president heads to his Clare golf resort.
