During the First World War no official standards existed for the naming of aircraft and so all designations at this time were assigned by the original manufacturer and both numbers and names were used. From 1918, aircraft were given names based on a set of rules, and individual variants designated numerically as mark I, mark II, etc. as per RAF practice, including aircraft purchased from American sources. For more information on specifics of the system, see
British military aircraft designation systems. Aircraft purchased from local sources often retained their original commercial names such as with the
Barkley-Grow T8P-1 or the
Waco AQC-6, particularly if purchased in small numbers, impressed or not purchased from the original manufacturer. CF-100 and CF-105 were
Avro Canada company designations that preceded similar RCAF designations that became the basis for the Canadian Forces designations instituted in February 1968. Unlike the US designation system, there is only a single sequence rather than separate sequences for each role, and numbering started at 100, prefixed with C (for Canada) and a role letter or letters. According to R. W. Walker. 102 and 103 were not used in the CF system to avoid confusion with Avro's use of those numbers for the cancelled
Avro Canada C-102 Jetliner and the
Avro Canada CF-103 interceptor project. ==Aircraft listing==