I was going to transition to the air defence capability of the destroyers, which I indicated. We've had significant enhancements built into the self-protection capability of the modernized Halifax class from an air defence perspective, significantly better than the Legacy class. In some ways it is more capable than the destroyers themselves with the exception of the missile system. We continue to operate the missile system in Athabaskan, which is the last remaining vessel of the class, so we'll keep that system alive.
As indicated in a previous response with respect to the replenishment gap, the options are on the table now to look at a variety of different approaches and the possibility of the combination of different approaches as we look at what I call smart scheduling through to the possible securing of a capability on the contractual or lease perspective from a key ally for a few months at a time. We could do this a few times over the next little while.
We're exploring some other options with industry potentially to look at how we can come up with a more sustainable, medium-term solution that would take us right through to the full operational capability of the Queenston class. That would be the early 2020s, probably 2021 or 2022, by the time we have the second ship and both ships are up and running. We'd be looking at something that might be able to bridge that gap completely. Those options are fairly well developed at this point. As I indicated, I am providing advice to the minister this week on some of those options and looking for direction with respect to how the government may want to proceed.