For all the levels, serpentine move really helps(especially 1948, in which I didn't have to use gas, or when the other plane is faster than you).
Do note that there are 60 stars overall. So you don't really have to perfect all the mission...
to the developer, I hope there was a multiplayer of this type of game... like 2 teams have their own bubble where opponents can't enter and there is this center bubble where we blast each other....
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