Aneeshm, I think your colony airbase is a good idea, except maybe there should be a requirement that it's somehow connected to your civ, which must have the oil strategic resource (for refuelling). I know, I know, airbases are useful mainly on uninhabited islands, so my suggestion couldn't then be implemented easily, but it's a thought. Then again, unconnected cities can still serve as a base for aircraft. Hmmm, maybe that's a little unrealistic too.
And no, we can't just build colonies anywhere! A colony is a territory claimed by a nation, so we can't just place one on that silk resource right next to the Chinese capital! Unless you're looking for a fight, of course...
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