Let me get back to you. We're not sure that there are, but I would draw the committee's attention to the last page in our handout. Just because an airport has fewer than 60,000 movements doesn't automatically mean that it loses the tower service. We also look at other factors.
One of the factors is the number of scheduled movements, as well as whether it has scheduled passenger operations, the complexity of the airspace, and the airport surface itself. A variety of different factors can enter into it. In terms of the complexity of the surrounding airspace, I believe the member mentioned Windsor, Ontario. One of the unique situations we have to deal with there is the proximity to Detroit and the very high-density terminal airspace in Detroit. Some of the Canadian airspace is actually controlled from Detroit.
There are a variety of factors. It's not a simple arithmetical calculation; there are a whole host of other issues, but we will get you all the specific information.