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 . 
1. Latitude/longitude , including for days in port, show representative decimal positions for each day, as calculated by the Old Weather project's analysis program. As such, they differ by varying amounts from the positions recorded, usually at noon, in the log pages. In addition, some latitudes/longitudes have been amended in edited logs for errors in the logs, for errors in identifying locations by the analysis program, or simply for greater accuracy. In all cases, refer to the log-page scans for the positions as originally recorded. Not all log pages contain this information and the ships' positions have therefore often been estimated.