Cargo airlines (or airfreight carriers, and derivatives of these names) are airlines mainly dedicated to the transport of cargo by air. Some cargo airlines are divisions or subsidiaries of larger passenger airlines. Air transport is a component of many international logistics networks, managing and controlling the flow of goods, energy, information and other resources like products, services, and people, from the source of production to the marketplace. Logistics involves the geographical repositioning of raw materials, work in process, and finished inventories.
Larger cargo airlines tend to use new or recently built aircraft to carry their freight. However, many still utilize older aircraft, including those no longer suited for passenger service, like the Boeing 707, Boeing 727, Douglas DC-8, DC-10, MD-11, Airbus A300, and the Ilyushin Il-76. Examples of the 60-year-old Douglas DC-3 are still flying around the world carrying cargo (as well as passengers).