The "Bremen" aircraft left Baldonnel Aerodrome in April 1928
Ceremonies have been held in Dublin to mark the 90th anniversary of the first east-west flight across the Atlantic Ocean.
On April 12th, 1928 a Junkers W.33 aircraft named the "Bremen" departed Baldonnel Aerodrome bound for North America.
On board was the officer commanding the Air Corps, Colonel James Fitzmaurice, and two German crew members - Captain Kohl and Baron Von Huenefeld.
Some 36 hours later, they landed on Greenly Island on the eastern shores of Canada.
The Defence Forces says: "This was a truly remarkable achievement given the prevailing winds, the treacherous weather conditions and the multiple previously failed attempts.
"Colonel Fitzmaurice and the crew of the Bremen were hailed as aviation pioneers and their achievement still stands as one of the greatest chapters in aviation history."
At Casement Airbase on Thursday, a ceremony was held at the very spot from which the Bremen departed on its voyage.
It included music from the Defence Forces Bands, a tribute from the Artillery Corps and a flypast by the Air Corps.