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Such aspects certainly qualify as types or classes of "service." As a result, the airlines do charge different prices for each clas. There is a sequence of classes, say Y_H_I_J_K_M_Q_W. This means there is also a sequence of prices for those classes, from lowest to highest price, which is called a fare ladder. Business Class and First Class are also given one-letter codes. For a number of airlines, Business Class is "Z" class. Aside from the one-letter booking classes, on occasion there are also "fare basis codes" that can subdivide the one-letter booking classs. For instance, an airline may distinguish between flights bought with less than 3 days advance purchase or less than 21 days. Some airlines may offer a different set of rules (such as upgradability, refunds, etc) on the flight if its bought "last-second." That counts as a separate "class of service." It represents a different kind of inventory being sold. We are so pleased to have you visit our web site. We use a combination of search protocols and special deals with wholesalers and consolidators to provide the greatest access we can to low fares on the broadest list of destinations. We hope that AirGorilla.com will become one the several you routinely check for good prices and the right flight schedules for all your travel needs -- including airfare, hotel reservations, car rental, airport shuttles, airport parking, and oh so much more! Best Regards and Happy Travels, | |