Serp, you forgot to mention that if you're attacking a neighbouring C3 then before stage 3 you should place one of your LRDs (or any land unit will do) right next to the town or city you are about to attack the defences of with your FP wing. This acts as a 'spotter' and greatly helps your attack. This only applies to neighbour countries.
You guys need to realise what weapon responds to what or what is most effective against what. Interceptors will attack anything that flies and attacks something in the country. Helicopters will basically attack any land forces that attack their country. So you can take a country without even disturbing the ints.
When you get to higher level wars then attacking int wings individually when they are on the ground like the advice above says, instead of luring them out by attacking a town/county, is not an efficient way to do it. You will be fighting 2 wings instead of 1 for each attack.
There's many things like this to learn, serpents variations, so go for it, and keep reading, seems like I'm often letting secrets out here, ha!