To make the game more exciting and irritating 
we can have Terrorist to replace Barbarians in the information age. Every civ and city is prone to Terrorist planes attack. Improvements such as Intelligence Agency in BTS would be able to prevent and lower risk of Terrorist attack.
This can be part of the story as we play. It would be random as well.

we can have Terrorist to replace Barbarians in the information age. Every civ and city is prone to Terrorist planes attack. Improvements such as Intelligence Agency in BTS would be able to prevent and lower risk of Terrorist attack.
This can be part of the story as we play. It would be random as well.