Ours are based on a national formula. That's a practice that has long been established. It's to try to avoid discriminatory treatment throughout the country. I think it's one that has worked well.
The alternative model is site-specific charging. The problem with it is that it's very volume sensitive. For a given amount of fixed cost that you would have at an airport, the less traffic you have to spread it over, the higher the unit cost becomes. It becomes very dramatic if we go away from the current system, and we don't propose to go away from it, because it seems to work well, and all of our customers seem to find that it's fine.
We are concerned in this particular case that to the extent we would incur more cost by putting a tower back in, it would not be borne by the people who are asking for it; it's going to be borne by the rest of the people in the country who don't even fly to Mirabel.
In our view, it is a good candidate to look at and tell them that if they really want that service, even though it doesn't fall within any of our level of service guidelines and neither Transport nor we feel that it's a safety issue, we can provide it, but they will have to offset the cost.