The airmen concerned had given their parole not to escape, and were allowed to wander freely in nearby towns. In practice Allied airmen were returned to the Northern Ireland border while Luftwaffe were interned for the duration. As far as I recall, the British authorities did not want to endanger this working relationship with neutral Eire.
Repairable Allied aircraft were also flown out of Eire, including Fortresses, Liberators and Hudsons on ferry flights which sometimes landed on beaches. A couple of Hurricanes and a Lysander (?) were purchased by the Eire government and retained for their own use. At war's end a German crew took the latest Ju88 night fighter and landed near Dublin. The crew were interned and the aircraft flown to Britain by Lt Cdr 'Winkle' Brown.