Thank you for the question.
As the member has already said, the Office of the Parliamentary Budget Officer has done a certain amount of research on the missions.
I believe the Department of National Defence released their own estimates of what the mission would cost.
Understand that when the PBO does work in this area, they are basing their estimates on industry standards. They are not basing the estimates on specific planes. The National Defence costing is actually based on the planes and equipment they have in theatre, whereas PBO's estimates would be based on standards.
A credible estimate, a credible way to do things...but it's much more high level. It is an estimate. It's an “up to” amount. The key drivers in those costs are the number and types of equipment they have over there and the number of missions they are flying. As those change, the costs will change. National Defence would basically have better data at their fingertips in terms of the cost per flight, whereas PBO would be using a generic estimate. That's why you'll see a difference.