Ryanair have said all the 500 maintenance jobs the airline offered to create in Dublin have now been lost to other airports.
The company revealed last month that 200 of the positions were being located at Prestwick Airport in Glasgow.
The airline offered to base the 300 remaining jobs at Dublin Airport if the Government helped the carrier acquire Hangar 6 which is occupied by Aer Lingus.
However Ryanair spokesman Stephen McNamara has said the Government has failed to secure the jobs.