Hello! I've been thinking for a while about if it's possible for myself to upgrade, say, an F-22 to level 20. I've made 40,350,000 credits in the past 9 months of playing the game (as in that's how long I've been playing it), but I've been spreading my funds all over the tree. So I'm curious, at my current rate, could I get an F-22 from level 4 to level 20 in a few months? Thanks if you choose to reply, and hopefully this can provide information for others similar to me.