Biggles, fly the SPIT MK I....ive been flyin for..oh say about a week and i have 140 somthin (or more) perks.
its a toejamty plane, toejamty plane=high ENY value, High ENY value plane shooting down a low ENY plane=lots of perks.
an average sortie i shoot down 3 or more planes. and unless its a C-47, your going to get at least 1 perk point per plane(like you shoot down another mk.I) , in my average sortie i earn 3-8 perks.
see the plane has 6 .303 machine guns. they dont do jack daniels unless you pump up the nme plane with bullets. usually 200-400 rounds in one spot(like one area, a wing...or the other wing...or fuselage) does it fer me(good thing thers 2400 rounds).
You have to wait till your 200 or less yards away, then load the plane up with them BB's.
p.s. make sure your convergance is set to around 200. i think its 200 by default