Antonov An 990 ✯
During the Cold War, the Antonov Design Bureau (now Antonov ASTC) in Kyiv, Ukraine, did explore concepts beyond the An-225. Declassified documents from the late 1980s reference studies for a "super-heavy transport" to support the Soviet Energia-Buran space program and oversize cargo for Siberian development. However, those concepts were designated (a wide-body airliner) and An-325 (a modified An-225 with extra engines).
The following images showcase the colossal scale of the An-990 within flight simulators, often compared against other famous aircraft for size reference. antonov an 990