For example, within the airplane category, there are four classes of airplanes, such as:
Single-Engine Land.
Single-Engine Sea.
Multi-Engine Land.
Multi-Engine Sea.
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There are seven main categories under the FAA's class rating system. These classes are airplane, rotorcraft, powered lift, gliders, lighter than air, powered parachute and weight-shift-control aircraft.
• Class I airplanes, which typically are single reciprocating engine airplanes un- der 6,000 pounds. • Class II airplanes, which typically are multiple reciprocating engine, multiple turbine engine and single turbine engine airplanes under 6,000 pounds.
Traditionally, an airliner is divided into, from the fore to aft, first, business, and economy classes, sometimes referred to as cabins. In recent years, some airlines have added a premium economy class as an intermediate class between economy and business classes.
There are six classifications of airspace in the United States; A, B, C, D, E, and G. Class A is the most restrictive and Class G the least restrictive. They can be categorized as: Class A – 18,000 feet and higher above mean sea level (MSL). Class B – Airspace around the 40 most congested airports in the country.