I will take the committee through the detailed presentation. It will take about 20 minutes. To follow on what Mr. Geaney said, the principal objectives and remit of the authority is the implementation of safety standards that are set internationally by the International Civil Aviation Organisation and authorities such as the joint aviation authorities in Europe and IASA. Effectively, the aviation authority's job in Ireland is to implement international standards and we take a serious role in carrying that out through auditing Irish aircraft and so on.
The activities of the authority are regularly audited by the International Civil Aviation Authority and the joint aviation authorities and, every three years, by the Minister for Transport, as per section 32 of the Irish Aviation Authority Act. In relation to safety, the main job we have is to ensure the safety standards of Irish operated aircraft and Irish aircraft operators. To give the committee an idea of the dimensions of the task that we face, the safety regulation involves four main elements. In relation to aerodromes and air space, we regulate safety standards at the three main State airports at Shannon, Dublin and Cork and we licence and regulate the safety standards at 11 other public licensed aerodromes, for example, Sligo, Galway, Knock, Waterford and the 13 private licensed aerodromes, which are smaller operation like Coonagh, Abbeyshrule, Castlebar and smaller airports. In addition to that, we ensure the safety of the Irish transport fleet. There are 237 large public transport aircraft on the Irish register, whereas there are just 109 on the Belgian register and 200 on the Dutch register, so the Irish figure is significant. We have 434 smaller aircraft in the State, which are private aircraft, trainers, Cessna 152s and so on and we have 46 approved maintenance organisations. Principal among these would be FLS, Lufthansa, Airmotive and so on. We also look at the operations of aircraft operators and airlines in Ireland. We regulate 19 airlines. Members will be familiar with the larger ones such as Aer Lingus, Ryanair and Cityjet but there are other smaller airlines on the Irish register.
We have approximately 1,200 student pilots and 1,800 commercial pilots whom we test and issue with licenses. We simulator check them in relation to Airbus and Boeing pilots. We have 490 aircraft maintenance engineers for whom we set the standards of their education and monitor their skills to ensure they are capable of carrying out repairs to the highest international standards.
The final aspect of the authority's work is air navigation regulation. We have 278 air traffic controllers in Ireland and we regulate their standard and the airspace and the radar and communications systems. That gives a rough idea of the dimensions of the industry. The second part of the activity of the IAA focuses on our air navigation services. There are three main parts to this. There is en route air traffic control services, which is aircraft that over fly and do not land in the State. This accounts of 65% of our revenue. The second main element is terminal ATC operations, which is aircraft landing in Dublin, Cork and Shannon airports, which accounts for 11% or our revenue. The third element is the north Atlantic communications which accounts for 16% of our revenue. In total, the air navigation services account for 92% of our revenue.
It is important to realise that the Irish air navigation network is very much part of an integrated European network. Europe, air traffic-wise, is still organised on a national basis. It is much more complex than it needs to be. The main reasons for this are historical: sovereignty, national boundaries and so on. I will return to this later on in the context of the European single sky initiative, but it can be seen that it is quite a complex system.
The map indicates the main areas in which there were air traffic control delays in 2002. Green does not really mean go, but red definitely means stop. The London area and the south east of England has been the main bottleneck for the past five years. Often, when one is sitting on the ground at Dublin Airport and one hears there is an air traffic control delay, it is not because of delays in Irish air space but that before the aeroplane can take off there must be clearance from the central flow management unit in Brussels to fly through UK or French air space on the way to one's destination. The point is that often the delay is not necessarily caused in Ireland because we are part of a system.
The North Atlantic, because of Ireland's situation, is very important strategically. Effectively, the strategic position of Ireland means that we pick up a substantial part of the traffic flowing between North and Central America and Europe. The Shannon FIR and SOTA - the Shannon flight information region and the Shannon oceanic transition region - is the area in which we provide air traffic control services. The other area indicated is where we provide the north Atlantic communication services. The IAA provides services in both these regions. To put our business in context, 70% of the traffic to North and Central America uses Irish air space, so we are in quite a good position from a practical point of view.
Inside the yellow box is the area in which we provide actual air traffic control services and the larger red box is the eastern part of the North Atlantic, where we provide communication services. The air traffic control services in the red box are provided from Prestwick in Scotland. The members can see that our position is strategic - we pick up quite a good deal of the traffic from North and Central America to Europe and vice versa.
We have radar coverage approximately 250 miles off the Irish coast in all directions. We have four main radar sites: at Dooncarton in County Mayo, Dublin Airport, Shannon Airport and Mount Gabriel in west Cork. The yellow area is the area in which we control aircraft that are coming in from the Atlantic. The essential service we provide, which is unique in Europe, is that we take aircraft from the Atlantic, separate them into the correct flight levels and then assign them onwards towards Brussels, Frankfurt, Paris or Geneva depending on where they are going. Our role is unique: we often refer to Ireland as the marshalling yard of Europe. The traffic in the North Atlantic does not actually have radar coverage: the first radar that aircraft meet after coming across the Atlantic is Irish radar at the interface about 250 miles west of Galway.
To give a summary of our performance, the main comparison relates to our performance in 2002 over 2000. We chose 2000 because 2001 was not a very good year to compare - it was a very unusual year for aviation. In the upper airspace we had virtually no growth. A significant part of this was due to the weather patterns of the North Atlantic. More significantly, we were down 7.4% in terminal traffic in the State airports of Dublin, Shannon and Cork. On the North Atlantic, which is probably the best figure for overall traffic, we are down 5.5% over that period.
Moving on to our business performance, it is important to realise that the IAA is a cost recovery organisation. Effectively, we bill all our costs to the airlines and we recover them through the Eurocontrol charging system. When we make a profit, it is effectively a profit on the return of assets to the State or on the usage of the assets. The statistics show that our profit before tax was down 15.7% last year, which is reasonable in the context of the general performance of the aviation industry world wide.
The next chart relates to our charges. I draw the attention of the members to the international cost-competitiveness of Irish aviation, particularly our air traffic control charges. There is a standard measure for overflying charges and we charge aircraft that overfly Ireland based on their weight and on the distance they fly. Ireland has the lowest overflight charges in Europe and has had for several years. In the UK, for instance, the charge is about €82 per unit while we are charging about €29 per unit.