The provision of transatlantic air services between Ireland the US is governed by the Ireland-US air transport agreement. In accordance with the terms of that agreement designated airlines of both countries are free to operate air services on specified routes between the two countries. There are no limitations on capacity offered by airlines on such services and airlines are free to determine air fares in accordance with their own commercial judgment.
In relation to scheduled air services, Irish airlines currently enjoy access rights to four US points — New York, Boston, Chicago and Los Angeles — while US airlines may serve Ireland from any US point. In relation to charter services, both Irish and US airlines can operate from any point in the US to Ireland.