Thread:SlyCooperFan1/@comment-37382414-20181212184024

I will only put the base model which gave the name to the series :

Flanker-B : Su-27

Flanker-C : Su-27UB

Flanker-D : Su-27K / Su-33

Flanker-E : Su-27M / Su-35

Flanker-E2 : Su-37

Flanker-F : Su-30

Flanker-G : Su-30MKK

Flanker-H : Su-30MKI

Flanker-I : NATO won't use I and O letters

Flanker-J : Su-27SM

Flanker-K : Su-35S

Flanker-L : J-11B

Flanker-M : to be announced (probably J-15)

Flanker-N : to be announced (probably J-16) 