It just means that in addition to charging perk points for perk planes, we can also charge perk points for ordnance. How it will work is you will have to use your perk points to equip your plane. Every rocket, bomb, and round of ammunition will cost perk points. The more powerful something is, the more it will cost. .50 caliber rounds will be a lot cheaper than 20mm rounds, but you do carry a lot more of them. The cool thing is that if you score a hit with a round, you will not be charged for that round. So if you get really close and hit with all of your rounds, it won't cost you any extra perk points. .30 caliber rounds will always be free so even if you run out of perk points, you can still fly a Spit I or Hurricane I. Note that if you get shot down you will be charged for all the ordnance that was on the plane. Another cool thing about this is that if you like the heavy weaponry but aren't such a good shot, you will now be able to buy additional perk points with your credit card so you can always get that extra boost if you really want it.