The outpost level took me a while to solve....I was in the correct path at first, then I went on to a different path because I thought it wasn't working out...after a while I went back to the original path and then solve it....
Wow after I posted the last message I founded out how to beat them. I kept the distance between my plane and the Spotters' and were able to pick them off one by one.
Im kinda stuck on the 1949 stage. It seems impossible for me to destroy even one Spotter NN20 let alone the five of them......It seems that they can hit you from all angles even from the back so its hard to shoot them down. So I tried using the gas to damage them..but they are so slow that they wont fly into the gas...as in by the time they fly into the area where the gas was, the gas would have dissappeared by then. Anyone know how to defeat them?
 "Frozen Islands"){kind=icon}
 "pulse"){kind=icon}
 "SteamBirds"){kind=icon}