So how do you know it's a 06 and what makes it different?

In any case I have come up with a rational for owning 9 AAs. especially for us old guys that are supposed to get motivated to get off our rears and get out of the house. You need one of each frequency so you can play with two friends (or make new friends if you don't have two flying buddies). You need one of each frequency to be charging as you fly so you don't get the inclination to just go back in the house while waiting and end up taking a nap. And you need one of each frequency to let the one you just flew cool down for 10 before recharging. Now that I think of it you actually need 12 planes - the extra three to use when one of the others goes bad.