Airlines are transport providers in the travel and tourism industry, providing scheduled or charter flights for passengers and cargo. Airlines follow a hub-and-spoke model to provide connections between destinations. They typically own fleets of aircraft, and employ crew and other personnel to provide services for passengers. Airlines offer both economy and business-class seating options, and may provide additional services such as in-flight entertainment, meals, and baggage handling. Airline companies can be public, private, or a combination of the two.