Transport aircraft is a broad category of aircraft that includes:
An airliner is a large Fixed-wing aircraft with the primary function of transporting paying passengers A cargo aircraft (also known as freighters or freight aircraft) is an Fixed-wing aircraft designed or converted for the carriage of goods rather A mailplane is an Aircraft used for carrying Mail. Aircraft that were purely mailplanes existed almost exclusively prior to World War II. Military Transport Aircraft or MTA is a division of EADS which designs manufactures and commercialises light and medium transport aircraft