The union representing air traffic controllers says there is an "urgent" need to address current staff shortages.
It comes as Dublin airspace was forced to close for a third time in just three weeks, due to a lack of staff.
The closures were to facilitate air traffic controllers taking a break.
Niall Shanahan of Fórsa says more staff are needed before the busy summer season:
''We’ve seen it once before and quite some time ago,'' he said.
''It was 2008 where there were some similar stoppages and again staff shortages were the route of that particular problem at that time. As I recall, the Irish Aviation Authority undertook a significant recruitment programme not long afterwards.
''The closures do reflect an ongoing difficulty with the air navigation service,'' Mr Shanahan said.
''It’s currently struggling with high traffic levels and very serious staff shortages and the shortage of air traffic control officers is not limited to Dublin or indeed to Ireland - it’s a global issue.''
400,000 people are expected to pass through Dublin Airport this weekend.