First class is the most luxurious and most expensive travel class of seats and service on a train, passenger ship, airplane, bus, or other system of transport. Compared to business class and economy class, it offers the best service and most comfortable accommodation.

Economy class, also called third class, coach class, steerage, or to distinguish it from the slightly more expensive premium economy class, standard economy class or budget economy class, is the lowest travel class of seating in air travel, rail travel, and sometimes ferry or maritime travel. Historically, this travel class has been called tourist class or third class on ocean liners.