How many bargain shoppers do you know who check the price of first-class tickets? Probably not many. First-class seats are expensive -- and there's your advantage. Because of the price, first-class seats are often empty. Airlines don't like to fly with empty seats. Sometimes, they'll sell first-class tickets for the same price as a full-fare coach ticket. It's called a "Y-up fare." They're not always available, and if you have to change your travel plans, it could cost a bundle to change a Y-up ticket. But if you're sure about your plans and are willing to pay a little more for a lot more comfort, ask about Y-up availability when you book your flight.