Caledonian Airways was a wholly private, independent charter airline in the United Kingdom formed in April 1961. It began with a single 104-seat Douglas DC-7C leased from the Belgian flag carrier Sabena. Caledonian grew rapidly over the coming years to become the leading transatlantic "affinity group" charter operator by the end of the decade. During that period, passenger numbers grew from just 8,000 in 1961 to 800,000 in 1970. The latter represented 22.7% of all British non-scheduled passengers. It also became Britain's most consistently profitable and financially most secure independent airline of its era, never failing to make a profit in all its ten years of existence. By the end of 1970, Caledonian operated an all-jet fleet consisting of eleven aircraft and provided employment for over 1,000 workers. At that time, its principal activities included group charters between North America, Europe and the Far East using Boeing 707s, and general charter and inclusive tour (IT) activities in Europe utilising One-Elevens.
The Douglas DC-7 is a retired American airliner built by the Douglas Aircraft Company from 1953 to 1958. A derivative of the DC-6, it was the last major piston engine-powered passenger aircraft made by Douglas, being developed shortly after the earliest jet airliner—the de Havilland Comet—entered service and only a few years before the jet-powered Douglas DC-8 first flew in 1958. Larger numbers of both DC-7B and DC-7C variants were also built, with a handful of aircraft converted to cargo hauling or fire-fighting after their commercial transport days had passed.
Caledonian Airways Flight 153 was a multi-leg nonscheduled passenger service from Luxembourg via Khartoum, Lorenzo Marques, Douala and Lisbon, before heading back to Luxembourg. On 4 March 1962 a Douglas DC-7C flying the route, registration G-ARUD, crashed shortly after takeoff from Douala International Airport, Douala, Cameroon in a swamp on the edge of a jungle 2.4 kilometres off the airport. It is the deadliest crash of a DC-7. It is also the second-deadliest accident in Cameroon surpassed only by Kenya Airways Flight 507.
Cameroon, officially the Republic of Cameroon, is a country in Central Africa. It shares boundaries with Nigeria to the west and north, Chad to the northeast, the Central African Republic to the east, and Equatorial Guinea, Gabon, and the Republic of the Congo to the south. Its coastline lies on the Bight of Biafra, part of the Gulf of Guinea, and the Atlantic Ocean. Due to its strategic position at the crossroads between West Africa and Central Africa, it has been categorized as being in both geostrategic locations. Cameroon's population of nearly 31 million people speak 250 native languages, in addition to the national tongues of English and French. Early inhabitants of the territory included the Sao civilisation around Lake Chad and the Baka hunter-gatherers in the southeastern rainforest. Portuguese explorers reached the coast in the 15th century and named the area Rio dos Camarões, which became Cameroon in English. Fulani soldiers founded the Adamawa Emirate in the north in the 19th century, and various ethnic groups of the west and northwest established powerful chiefdoms and fondoms.