Need Help; Nuts

[Ferigno]

Here's the trick. Follow the bombers close to the flags until they check off. Don't hit the fighters until you get the option to check out the 3 different flags (you'll know what I mean when it happens). Then all bets are off and you're fine. If you don't follow the bombers close and they get to the city before you and you're too far away, the level gets all messed up and you can't get the checkpoints.

I had to restart it.