Not really imporant but several planes have a number after them in brackets.
Applies mainly to WW2 planes but some MBT to
Example USMC 70s Unit 147 A-1 Skyraider (10)
Does the number represent anything?
Aircraft passes are determined by remaining 20mm plus cannon ammo if no other weapons are left - size 2 and above. Therefore - for WW2 in the main - where strafing planes with 0.50 or rifle calibre mg were needed - these are controlled by the strafe number - this is entered in the HEAT Top Armour byte, for fighter bomber or SEAD planes only. If entered an S:NN is displayed beside the plane's name on the buy screen. It can be used on planes with a 20mm plus cannon to reduce passes, but in this case - better to reduce the number of actual shots, if you do not want the plane to linger for strafing runs after offloading its heavier ordnance.