There were a number of different models looked at. There was broad consultation with all of the stakeholders in aviation.
Having an ordinary for-profit business corporation was looked at. The aviation industry itself was not in favour of that. It was more in favour of the non-share capital model because of the fact that ultimately any profits that would accrue in that model would come back to them. But you have to remember that this is a monopoly business; it's not feasible to look at this as a competitive business. You can't have competing air traffic control agencies where one is telling a pilot to turn left and the other is saying turn right. This is a natural monopoly business.
How do you deal with that and yet make it perform as if it had competitive pressures? We think ultimately that the non-share capital model and our governance structure, which sees our customers as having a big role—on our board, for instance—is working.
That's really the genesis of how we came here.