[REQUEST] Anti-Air Zone's

Hello,

I'm just wondering if there is a script out there that you can define zones on a map that any Air vehicle is not allowed in?

Preferably the vehicle would take damage over time and if the person flying persisted to stay in the zone it would eventually become disabled and crash.

I'm sure I could modify the Safezone script I use to do something like this, but wondered if there was already something available.