Dr. Adrian Corcoran:

We set the capacity so we can control that growth. We cannot grow at any time of the day we want. There just are not slots available. When we set that capacity, we make sure the airport can operate in an efficient, safe and effective way and that there is sufficient capacity at security, for example, or that the runway is controlled in terms of how many movements there can be on it. That is a key element we take account of when setting that capacity.