Flight class is a term used to describe the different levels of service and amenities offered on an airplane. It is typically divided into economy, business, and first class. AVES is the four-letter solution for flight class, which stands for Aircraft, Vehicle, Engine, and Systems. This acronym is used to refer to the various components of an aircraft, such as its engines, wings, and other systems. Flight class is an important factor in determining the cost of a ticket, as well as the level of comfort and service passengers can expect during their journey.