I dont know this for sure but i suspect the reason some of these cities or requiring AMA
is because some clubs made a pitch about the AMA to them.

I do think if someone was to cahallenge them in court they would have to back down
as long as that person could show they had liabilty coverage in force.

but on the other hand its really not worth hassel and expense just to fly a model to
go to court its easier to pay the 58.00 and go fly.