Why don't AI's air units attack us ?

[fomalhaut]

I think this is very unnatural.
What reasons are there?
Technical problems, or something else??

[Ozor Mox]

The AI does not use air units (including missiles) on novice or easy level as a form of handicapping, however as far as I know on normal or above level they should use them.

[fomalhaut]

Regardless of the AI level, I have never been bombed my city.
Also I have never seen that AI fired nuclear weapons or cruise missiles towards the city.
Definitely this is one of the causes of AI's weakness.
I'd like to know the reasons why.

[Ozor Mox]

In my latest game against the AI (on difficulty normal) I have seen them use both cruise missiles and nukes. Not seen regular planes yet though.

Edit: Correction, they are using planes!

[rainbowrobin]

I've played a bunch under 2.3, some under 2.4, never seen air units or submarines. Do see battleships, if they get far enough. Don't think I've seen spies. I've lost single units to diplomat bribes, but never a city.