Peace activist Margaretta D'Arcy has been released from Mountjoy Women's Prison.
Speaking outside to supporters who had gathered, she said she has no regrets.
The 79-year-old served nine-and-half weeks of a three-month sentence.
She was met outside by her son Finn Arden and peace activists who are against the use of Shannon by military aircraft.
D'arcy was jailed for illegal incursion of the runway at Shannon on 7 October 2012.
She will hold a press conference later today.