Holidaymakers heading to Dublin Airport this weekend are being advised to arrive at least three hours before their flight.
Travel agents say a combination of rising passenger numbers, the busy holiday season and tight security means people need to leave themselves plenty of time to get through the airport.
Heightened security checks are being blamed for major delays at European borders at the moment.
The Irish Travel Agents Association says passport control at Dublin Airport is clearly understaffed.
The group is looking to meet with reps from the Department of Justice to discuss the issue.