I hope you don't mind this thread started by the numbers-nerd and designation-obsessed one, but since I think I'm not alone to repeatedly need to check, what the different letters mean; even more so since there seems to be a change in designation system. Maybe we get a collection over time hopefully even including the Chinese characters.
Just out of memory ...
H (?) = for "Hai" = naval (J-11B vs J-11BH)
D (电) = for "Dian" = electronic warfare (HD-5)
J (?) = for xxx = carrier/naval (JL-10 vs JL-10J)
S (?) = for "Shuang" (?) = twin-seater (J-20S)
T (?) = for xxx = catapult (J-15T)
More later ... need to work again
Just out of memory ...
H (?) = for "Hai" = naval (J-11B vs J-11BH)
D (电) = for "Dian" = electronic warfare (HD-5)
J (?) = for xxx = carrier/naval (JL-10 vs JL-10J)
S (?) = for "Shuang" (?) = twin-seater (J-20S)
T (?) = for xxx = catapult (J-15T)
More later ... need to work again