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What do you have to do in the mission (every bit)? Or what is the mission called?
What level of difficulty are you on? Normal, hard, expert or ace?
What rankings are you getting? S? The more S ranks you get (and the higher the difficulty) the bigger the bonus.
What planes have you got? (to complete the game I only used the F15-ACTIVE and the A-10 both eith multi-target missles and then I got the X-02 as soon as I had money). Might be you have to sell eery plane except the A-10 to get a plane like the F15-ACTIVE. Might be also good to sell all your weapons expect the multi-target misslies for the A-10 and if you have an F15-ACTIVE, that.
Do you shoot down the orange planes (threy have a bigger bonus)? And the plane that only shows up on radar when you get close (has a name with it as well)?
Try shooting as many things as you can (which of course you do but even after getting S rank you can still get some more points).
Let me know okay? I don't know any chaeats but I can advise you on how to economise and get money hence planes and weapons without cheating. Hey that sounds good doesn't it?