Security remains tight at Dublin Airport following this morning's code red alert.
The main terminal was evacuated after a suspect package was discovered in the building.
The Army Bomb Disposal Unit carried out a controlled explosion on the rucksack, which was found to contain no explosives.
Services are now returning to normal but 12,000 passengers and 70 flights have been affected.
Dublin Airport Authority's Vincent Wall apologised to passengers but reiterated that they have to take these incidents seriously.
Aer Lingus said that its schedule should be mostly back to normal by lunchtime, with a small number of delays later.
They are advising passengers to check in as normal for flights.