Business-class tickets (like all other seats on the plane) carry a price tag based on market demand, which means the cost can vary widely by airline, route, and date. It takes time to install newer, nicer seats, which require an airline to take aircraft out of service, and that doesn’t take into consideration manufacturer delivery delays and lengthy government certification reviews (a snag several carriers hit when installing sliding doors to seats). With a little advance homework, you can find yourself in the best business-class seats offered by an airline if you know which routes to book.