The Irish Aviation Authority (IAA) recorded a pretax profit of €16.2 million reflecting a growth in international traffic during the year.
The regulator's revenue primarily comes from charging aircraft which use Irish airspace, the majority of which do not land at Irish airports, but instead comprise en route overflying traffic between Europe and North America.
Turnover increased by 2.6 per cent to €127.7 million in 2005, up from €124.5 million in 2004.
The authority said the revenue growth reflected the first full year of operations for new air traffic management systems, at Dublin and Shannon, which enable air traffic controllers to handle higher traffic volumes.
Air traffic in each of the Authority's main areas of operations showed an increase over 2004 levels with an average increase of 6.1 per cent.
The IAA is responsible for air traffic control services in Irish airspace and the enforcement of safety regulation of the Irish civil aviation industry.
En route traffic comprising all aircraft using Irish controlled airspace rose by 5.8 per cent to 277,779 flights.
Aircraft landing at the three State airports of Dublin Shannon and Cork rose by 6.9 per cent to 241,576 flights.
