In this particular circumstance, as you indicate, we've had other fleets of C-130 aircraft, the ECHO series, that we retired in recent years that had been built in the 1960s. What is very fortunate in this case is that we have been co-operating with our Australian colleagues for decades on understanding the fatigue life and how what we call the legacy Hornet, the CF-18, operates, where it takes fatigue, and how it operates at high altitude and at low altitude. We have literally taken new aircraft and tested them to destruction. We literally set up test beds and did that, so we had absolute understanding of how that aircraft operates. It was done as a combined test effort. A lot of the data was done here in Canada, in Montreal.
As a result, our knowledge of the structures is world-leading. In fact, the U.S. military sends aircraft to Mirabel to be repaired, as a result of our knowledge. As a result of it, the Australians gave us access to all the data of each of the aircraft. We know exactly what shape they're in.
We have actually expanded that further and we have discrete inspection points where we actually put the aircraft through a very detailed maintenance process, strip it down and look at it. Our experience with our own aircraft has been that there is less fatigue than expected, but nevertheless we've been doing that. They have followed a similar process. As we look at these aircraft from a structural perspective, we're very confident that what we have will be safe for anybody who flies in them. For us, that is job one.
That is part of my role, to ensure that the director of technical air worthiness works for me for all the aircraft, and also that it is capable of the mission and combat-capable. There are things we will do to the aircraft for configuration purposes—for example, in ejection seats and those sorts of things—just so that we're not supporting two different variants.
These 18 aircraft, plus a number of spares, will roll in and become part of our fleet. At some point they'll probably be indistinguishable from our existing aircraft. They will go through periodic updates to ensure that they continue to be safe and operationally capable.
You realize we're moving on to the next fleet, but this is a combat aircraft that needs to be combat-capable at all times, so we have some other initiatives we are looking at—weapon sensors, communications—not just for these aircraft but for all of them. We appreciate that the last of these could be operating to 2032 and must continue to be combat-capable.