Members of the Defence Forces are on stand-by for Dublin Airport from today.
It was announced last month that members would be trained to give aviation security duties at the airport in extreme circumstances.
In a statement at the time, Minister for Defence Simon Coveney says he agreed to the request on a clear assurance this is a distinct piece of work.
It will last no more than six weeks and the support will be stood down in August when the busy holiday period has passed.
Meanwhile. a further 14 flights to and from Dublin Airport have been cancelled today.
10 of the flights are operated by Aer Lingus, two by Scandinavian airline SAS and two by Royan Dutch Airlines.
The destinations include returns to Heathrow, Munich, Oslo and Amsterdam.
Aer Lingus previously blamed its cancellations on a rise in Covid infection levels among staff.
