Terrain doesn’t block LOS to/from an aircraft means only that. It doesn’t allow units to fire without LOS.
This is significant because Smoke Screen is not terrain and does block LOS to aircraft.
if 2 communist partisans move into the same hex as a tank can that tank then just move out of the hex?
if so can the communist partisans attakc the tank?
The Partisans would get Defensive fire rolls if the tank moved to an adjacent hex… There’s no reason why the tank couldn’t move away though as long as it was on it’s own movement/assault phase- it can’t move away when it isn’t it’s turn (I’m not sure what you’re asking here).