This makes no sense the D-9 is 5.0 in both AB and RB and 5.7 in SB on the other hand the A-5/U12 is 6.0 in AB and 4.7 in both RB and SB, the D-9 have better performance it’s faster, turn betrer and clim better it has better armament and bombs.
The D-9 should go back to its folder with the D-12 and the A-5/U12 should be foldered with the A-5 and the A-8.