Re: Technicality . . .
As I remember it, the No Fly Zones were established a part of the cease fire agreement following the Gulf War. They were established to protect the Kurds from being murdered by Saddam.
Here's an article discussing the legality of the no fly zones by a prominent law school professor.
Here's an interesting article about a court case in Iowa involving a protestor of the issue. There are some good points on both side of the argument. BTW: the protestor lost.