That's a two-part question, Madam, if I understand correctly.
The first one is about interoperability and the use of our current infrastructure. Perhaps the best indication that our current infrastructure might not be a good base of reference is to look at the structure. For example, the way NORAD is structured, our main operating bases are probably going to be permanent, but the four operating locations date back to a threat that was perceived in the 1970s. I can't say that the latter structure would be totally adequate for what's to come, especially if we're thinking about next 30 to 40 years. That's one comment.
The second comment is that interoperability is absolutely critical. When you think of what NORAD does, just image a triangle with fighter aircraft at the tip. That fighter aircraft, of course, is critical to control. This is how we control the airspace. It relies on a system which has platforms, long base radars, airborne early warning which can communicate data link, people that are qualified, the training system, the standards, and so on and so forth.
It is better to take a look at the tip as the result of the whole triangle and in the triangle, of course, you have the infrastructure. There's no doubt in my mind that changes may be required no matter what replaces the F-18. It may or may not be required because it's not only a matter of runway, operation, or base location, it's the whole system here. It involves the sensor to sensor ability to communicate, man-machine interface, the weapons that would be used, and so on and so forth.
It's a very difficult question to answer now. With respect to the amount of money that would be required, again, it would depend on which platform the Government of Canada decides to purchase. At this point, I would deflect the answer to Gen. Hood because I really have no idea.