Thanks Oscar, and thanks, everyone for joining us on the call today. 2018 was a fantastic year financially, operationally and for our customers. We operated the most on-time flights in United's history. This is the result of the commitment and hard work of the entire United team that came together to deliver a great operation and experience for our customers. From the frontline to the corporate support center, everyone played a part and I'd like to thank all of them. In 2018, we continued to run a great operation, including top-tier [D-0] performance, all while flying a record number of passengers and with record load factors. We had the best ever consolidating completion factor in our history and drove a record 9.3% revenue growth year-over-year. As Andrew will talk about later, we believe our strong operation and continuously improving customer focus drove about a point of PRASM improvement in the quarter. These operational steps, coupled with our strong PRASM performance and our return to margin growth in the fourth quarter are clear evidence that the growth plan we announced this time last January is the right strategy for United. As we look at 2019, we all know that there is a relationship between costs, with fuel being the industry's most volatile cost and revenue. It's precisely what gives us the confidence to give annual and multi-year adjusted EPS guidance. This historical relationship is why we were confident giving full year guidance for the first time last year. And we're able to maintain and raise that guidance even as fuel rose significantly during the year. This historical relationship not only gives us confidence for one-year guidance, but also allowed us to provide $11 to $13 adjusted EPS guidance for 2020 because we were confident that PRASM would increase in the world of higher fuel. Set another way, unpredictable fuel costs are reality, but at United, they will not be an excuse to miss our guidance. Our revenue strategy, combined with our cost discipline gives us confidence that we can continue - that we can continue to meet or exceed our adjusted 2019 EPS targets anywhere between $40 and $80 Brent Oil. As Oscar mentioned, there's been a lot of concern on Wall Street about the health of the economy as we enter 2019. We normally don't react to a single week's worth of bookings because of the inherent volatility in bookings. But the first full week back from the holidays is unique, as business customers are back in the office and planning business trips. It's the largest booking week of the year and the first opportunity to see what's happened with corporate budgets. Historically, the companies we are seeing weakness are concerned about the outlook. They almost always reduce the travel and entertainment budget for the coming year. As a result, business bookings for the first week of the year are reasonably good forward indicator for the health of economy. And despite all the stock market volatility hindering, despite the government shutdown, our business bookings is measured by all large corporate accounts and travel agencies, we're up 11% at slightly higher yield last week. The world can certainly change going forward. But United Airlines demand remains solid, at least, based on the data we have so far. Over the last several earnings call, you've heard us talk a lot about the benefits of our growth strategy. But today, I want to talk to you about another change that's hard to quantify and even harder to proceed from the outside of the company, but it's essential to driving strong PRASM and margin growth. In short, at United, we're changing our culture. We started to shift to a nimbler, faster and more action-oriented approach to improving our customer and employee experience. I can't tell you the number of times I sit in a meeting or someone walks into my office to show me something new and innovative that we're doing. You're able to see it in the performance of Gemini, to develop an industry-leading mobile app and the powerful new technology that we put in the hands of our employees. Our teams are developing new ideas literally every day and testing them in speeds we wouldn't have thought possible. We are now experimenting with all kinds of new initiatives and solutions, quickly expanding those that work and pulling back those that don't. And this is happening throughout United. At the start of last year's budget process, as an example, we asked the teams to keep M&A total headcount flat, despite growing 5% and adding all kinds of initiatives to deploy. There's a fair bit of anxiety around this from the team, but we did it and achieved the great results that we announced today. For this year's budget process, we took it a step further and set a goal to keep total M&A spending flat. So, leaders had to fund growth, new initiatives and pay raises without spending a single dollar more. And I'm proud to say that the team had embraced that challenge with the positive 'can do' spirit. It isn't an easy target to hit, but aided by our new entrepreneurial culture that’s taking root, we are confident we will do it. We're committed to making United best airline in the world. We have the world's best network potential and this ongoing culture change really is a significant and difficult to replicate competitive advantage for United. We had a great year in 2018, and I again want to thank the team for delivery. There's a lot happening at United. The growth plan, focused on the customer, great operations, and a new action-oriented culture facilitated by core4, to name just a few. As a result, we're confident that we'll meet or exceed our $10 to $12 EPS guidance in 2019 for any fuel price between $40 and $80 per barrel. As we said before, unpredictable fuel prices will not be an excuse here at United. 2018 was an incredible year, and set a solid foundation for the strategy we laid out one year ago. We're looking forward to repeating our success in 2019. With that, I'll turn it over to Andrew.