First class is a travel class available on certain passenger airliners, intended for a more luxurious experience than business class, premium economy and economy class.
First class usually involves a limited number of seats (rarely more than 20) in a cabin toward the front of the aircraft that offers more space, comfort, service and privacy. First class is generally the highest class available, although some airlines have branded their new products as being above first class.
Business class is a travel class available on many commercial airlines. In the airline industry, it was originally intended as an intermediate level of service between economy class and first class. However, many airlines now offer business class as their highest level of service, having eliminated first class seating.
Business class stands out from other travel classes due to the quality of its seating, food, drinks, ground service and other amenities. In commercial aviation, full business class benefits from schedule flexibility and is usually referred to by using the code letters ‘J’ or ‘C’, though other letters may be used depending on the circumstances.
Premium economy class, also known as economy plus, is a travel class available on certain airlines. This travel class is situated between economy class and business class in terms of price, comfort and amenities. Premium economy class has become a standard equivalent to what economy class was like 40 years ago (or more);
Economy class is also called coach class to distinguish it from the slightly more expensive premium economy class.
Economy class is the lowest class of air travel seating. Every airline has an economy class.