FLYING business class is a luxury most of us fantasize about from the time we book our tickets to the time we debark, hurting and exhausted, from the economy cabin. Of course, perks like lounge access and legroom are tempting, but the cost of an upgrade is usually too hard for the average traveler to justify. Luckily, it doesn’t always have to be. Not only can you look out for Z-class fares, business tickets sold at discounted rates, but a number of airlines also consistently offer great prices on premium seats. If you want to take your next trip in style, put these carriers at the top of your to-fly list.