Absolutely. I would be happy to do that. Look, first of all, in our revenue forecast, we don't assume any change to some of the fundamentals of airline demand. We presume that airline industry revenues will regain its historical relationship with GDP, roughly about a point of percent. We also presume the same historical relationship between revenue and fuel prices. But what is very important is that as we've talked about for some time, what's different about us is that we have used the last few years to really materially change our network, our partnerships and our fleet and that really bleeds through in our forecast for next year. If you compare our capacity mix just in future schedules that we have published to what we did in 2019. We've taken 5 points of capacity out of our lowest RASM, lowest-margin long-haul flights, and we've grown 5 points of capacity in our highest-margin short-haul flights. Additionally, within the short-haul system, we've taken 5 points of capacity from some of our lowest performing, lowest RASM market and redeployed it into our Sunbelt hub, which are not just our highest RASM market, but some of the highest rosin markets in the industry. So when you think about that, that's 10 points of capacity mix that we've taken from truly the lowest RASM, lowest margin things and put into some of the highest margin things that that are out there. And you're seeing some of that trend already through '20. So that was a thing that have been in our past schedules. You see it in our quarter one schedules, and that drives a lot of our revenue performance. Now to put that into a bit of focus, 10 points of capacity in an airline of our size. You can think of that as larger than just about any airline hub with the exception of DFW, Charlotte and maybe one or two other hubs that our competitors operate. So that is a material reworking of our airline network over the last few years. But what's just as important is how we have done it, which is really to a significant amount of fleet simplification. So we -- over the last few years, we've shed 50 long-haul capable airplanes, many of which were really inefficient, like the 757 to 767. We've up-gauged both the regional jet and the main lines that we've got. And we've simplified the airline down to four fleet types. So what that enables us to do is in the fleet that's left, we can much more dynamically alter schedules to follow where the demand is. But we can produce schedules that, as you heard David and Robert talk about, are a lot more operable and frankly, a lot more efficient. So we've seen the benefits of that in our recent revenue performance, and we anticipate the benefits of that in the year ahead.