Sure. Well, Deane, it's probably, probably most helpful to just frame kind of what we did and where we are, right? We didn't bring that activity level down to zero. We try to resize it in a way that embrace this harsh, unfortunate near-term reality, but gave us a little bit of room just because -- back to Andrew's question, a number of dynamics that are hard to know in the short-term with absolute certainty, be it the retirement dynamic, how fleets are going to manage green time just even in the short-term, how folks are going to flex around the COVID effects as we saw in July and August and then in the other direction here in the first quarter. So as an operational matter, I think what John, Russell and the team are prepared for is a number of scenarios where when we see that recovery, we'll leverage some of the, if you will, the excess cost that is still there. Because again, we didn't take it to the bone, but also, we have -- we've laid in place plans that will give us an opportunity to ramp back effectively from a safety, from a quality, from an on-time delivery perspective, but also to have the right cost structure along the way. But we will be dealing with limits, right, in terms of our shop visit capacity in a particular window. And then that's part of the conversation we're already having with customers as they begin to think about the second half of '21. They want to make sure that they have their fleet in tiptop ready to go condition. So a lot that we're working through there. Clearly, our supply chain has been through a roller coaster right there along with us. I mean it was a year ago, I mean, literally, right now, when we're talking about not only continued volume ramps, but a new introduction, clearly at Boeing, with the MAX. And then literally weeks later, we're talking about slamming on the brakes. Part of what you saw in the fourth quarter is a little bit better inventory performance because the lead times and the cycle times in Aviation tend to be longer than they are in some of the other businesses. But we are working as closely as we can with the supply base to help them do what we're doing, and that is worked through the near-term here, where we have these volume pressures, but also be ready for, again, a number of scenarios by which we see a return toward more normal volumes.