Each year since 1959, Boeing Commercial Airplanes has published its “Statistical Summary of Commercial Jet Airplane Accidents Worldwide Operations”. The statistics presented in these Annual Summaries are based only on commercial jet airplanes which are heavier than 60000lb (27 tonnes) maximum gross weight. However, aircraft manufactured in the Commonwealth of Independent States (CIS) or the former Union of Soviet Socialist Republics (USSR) are excluded because of the lack of operational data. Commercial aeroplanes operated in military service are excluded but if a military-owned commercial jet transport is used for civilian commercial service, it will be included in respect of such operations.