Yes, there was a risk assessment done at the time, based on traffic volume--U.S. traffic, for example. Basically, a risk assessment was done at those airports, and those were the ones chosen.
There are 29 major airports in Canada that are class I and class II, but obviously the same level of security would vary, depending again on the volume.
Just taking Kelowna as an example, it exceeds one million passengers right now. Even though it's a class II airport, it's almost as large as some of the class I airports. So there are a number of criteria, which we work out with Transport Canada, and obviously it has to adjust, depending on the threats.