Highlight the microphone on the left side of the main menu in the campaign. Press the Right Mouse Button, then type "idaho". A new drop down menu that allows any level to be selected will appear at the top right of the screen.
Avoid wasting your time with rockets such as the Choker or Flash. Load up on Flak Rockets. You will be able to destroy oncoming enemy squadron before they enter firing range.
-Alter your wingman's weapons loadout before every mission. While you cannot issue orders to them during combat, you can at least make sure they have the firepower necessary to defend themselves and launch effective attacks against large enemy targets when needed.
-Heavier caliber weapons do more damage, but require better marksmanship and fire more slowly. Combine light-caliber machine guns with heavy cannon for the perfect blend of gunnery accuracy.
Use the rudder controls and lessen your airspeed to tighten your turning radius and close in on bogeys that are pulling tight turns during dogfights.
-Occasionally enemy planes fly away from you, and you cannot catch up. To prevent this, turn away. If done correctly, your opponent will turn towards you. Fly away for around five seconds then turn back. The enemy will fly towards you.