I'm not sure if you can, and that's the challenge I have with, for example, a three-hour tarmac delay. I think it's important to recognize the experience of the U.S., for example, in implementing three-hour tarmac delays. If you say that after three hours it's a delay, that means that really it's a two-hour tarmac delay, because the airline will be turning back to the gate within two hours. How do you explain that to...? Think about an international flight. You're sitting on the tarmac at two hours and you want to take off to go to Europe. The next flight is 24 hours later. You're told, “We need to turn back now, because we could be subject to a tarmac delay.”
We believe that the airlines are perfectly incented on tarmac delays. It's a wasted asset out on the runway. If it's within their control, they'll do whatever they possibly can to get back. I don't think there should be a hard and fast rule for that reason. As well, defining “control” is very difficult.