It is very difficult to answer this question as in those days SU
simply absorbed all the civil aircraft built and flown within the USSR
. As such, in addition to jet airliners it also operated helicopters, crop-dusters and a range of other types that were not necessarily airliners. It even operated some military types like IL
-76s on behalf of the military - the civilian marking helping to ease access to overseas ports. SU
only really became an airline in the more conventional sense in post-Soviet times - before that it was more like a civil aviation department of the Soviet Government.