مخططات السوخوي 11 الأولى إذ أن سوخوي تعيد إستعمال بعض التسميات القديمة لطائرات جديدة مثل سو9-11-15-17-. . . .
وهذا مقطع من ويكي بيديا يشير إلى هذه الملاحظة
Note: The Sukhoi OKB has reused aircraft designations on occasion, for example: the Su-9 from 1946 and the later Su-9 from 1956, the former was not produced in quantity. Sukhoi prototype designations are based on wing layout planform. Straight and swept wings are assigned the "S" prefix, while delta winged designs(including tailed-delta) have "T" for a designation prefix.
Example: S-37 and T-10.