Having entered service as one of the first-generation executive jets, the British Aerospace 125 has been operated by a wide variety of customers, ranging from government and military operators to private customers and businesses, it has also seen use by several airlines. Many of the aircraft's customers have been located in North America; in 1990, out of the 650 aircraft then being operated, more than 400 were being flown in the United States.  Reportedly, one aircraft was being sold every seven working days for a substantial period of the type's production life.  Successively larger versions were introduced to extend the type's appeal and to better compete against larger jets being used for business travel, such as the Gulfstream IV and Falcon 900 . 
Before the outbreak of war on 1 September 1939, the British government had already implemented the Air Navigation (Restriction in Time of War) Order 1939. That ordered military takeover of most civilian airfields in the UK, cessation of all private flying without individual flight permits, and other emergency measures. It was administered by a statutory department of the Air Ministry titled National Air Communications (NAC). By 1 September 1939, the aircraft and administrations of British Airways Ltd (BAL) and Imperial Airways were physically transferred to Bristol (Whitchurch) Airport , to be operated jointly by NAC. On 1 April 1940, British Airways Ltd and Imperial Airways Ltd were officially combined into a new company, British Overseas Airways Corporation (BOAC), that had already been formed on 24 November 1939 with retrospective financial arrangements. 
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