Nobody likes being on a long flight . Even if you're in the window or the aisle, it's not how most of us would like to spend our day. However, there are ways to improve your flying experience. If you're rich, that's buying first-class tickets. If you're not, it's checking in early and praying for the best. One of the best things about checking in early is that you can choose exactly where you sit. If you're flying alone, you don't get to pick exactly who you sit next to, which can be a real bum…