Are you guys taking how much food troops eat into account? Some guys buy jets first if they have a lot of turns to run because of that. I have no idea if this is true or not but they say the jets use less food.
I build spies and jets in the beginning, after I get pass 200.000 jets I change to 100% spies and buy turrets, Troops, jets, and and bushels, and oil, at that point. and I look for low prices on Tanks.