Maybe I'll start with that and allow Mr. Strom to follow.
When you take a look at Calgary, obviously you see we have terrain considerations with the Rocky Mountains to the west of us. As long as we can maintain the proper separation and the proper terrain clearance on the way in, there should be no safety considerations of moving an approach path closer to the airport one way or the other.
When we do look, though, at what is optimum for allowing an approach path, which is to keep the arrival rates up and the efficiency of the airport up, obviously what we also look for is the shortest number of track miles coming into an arrival, which is basically a reduction in greenhouse gas emissions. That usually becomes one of the priorities for the approach as we come into the city or the community.
I don't believe it's safety considerations, but there would be loss of an efficiency and more greenhouse gas emissions over the communities where we fly.