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Cargo airlines (or air freight 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. In 2018, airline cargo traffic represented 262,333 million tonne-kilometres with a 49.3% load factor: % for dedicated cargo operations, and % within mixed operations (belly freight of passenger airliners). Amid the COVID-19 pandemic, adjusted cargo capacity fell by 4.4% in February while air cargo demand also fell by 9.1%, but the near-halt in passenger traffic cut capacity even deeper as half of global air cargo is carried in passenger jets’ bellies. Air freight rates rose as a consequence, from 2.50-4 per kg, enticing passenger airlines to operate cargo-only flights through the use of preighters, while cargo airlines bring back into service fuel-guzzling stored aircraft, helped by falling oil prices. 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, McDonnell Douglas DC-10, McDonnell Douglas MD-11, Airbus A300, and the Ilyushin Il-76. Examples of the 80+-year-old Douglas DC-3 are still flying around the world carrying cargo (as well as passengers). Short range turboprop airliners such as the Antonov An-12, Antonov An-26, Fokker Friendship, and British Aerospace ATP are being modified to accept standard air freight pallets to extend their working lives.