 Most of the world's airlines allow their fleet aircraft to be modelled as a form of publicity.These include Delta Air Lines, Air France, British Airways, Aerolíneas Argentinas, Avianca, Aeroméxico, FedEx, Polar Air Cargo, Air New Zealand, Qantas, China Airlines, Singapore Airlines, South African Airways, Finnair, American Airlines, United Airlines, Lufthansa, Japan Airlines, Royal Jordanian, Korean Airlines, and Asiana Airlines.In the early days, airlines would order large models of their aircraft and supply them to travel agencies as a promotional item.