Passenger classes refer to the different categories of seating and services offered on commercial flights, typically divided into economy, premium economy, business, and first class. Each class provides varying levels of comfort, amenities, and pricing, catering to different passenger needs and budgets. Economy class is the most affordable option, featuring basic seating and services. Business class offers more spacious seating, enhanced meals, and priority boarding, while first class provides the highest level of luxury, including private suites and personalized service. These distinctions help airlines manage passenger expectations and optimize their offerings.