Heavy payload.

Sukhoi Su-20 fighter-bomber standing at Polish Military Hardware Museum, Warsaw. It used to belong to the 7th Reconaissance-Bomber Brigade at Powidz (Su-20's exclusive operator in Poland), but during an excercise it exceeded its maximum g loading and was damaged. It was then decided to donate it to the museum.

Su-20s were quickly replaced by more advanced Su-22. Both are export versions of the same variable wings geometry fighter-bomber, the Su-17.

Suspended under its wings are, I believe, 100 kg bombs, as well as UB-16 and UB-32 unguided missile pods (the number indicates how many rockets they carried).