Kirt,
As far as I know, ISAF has never formally voiced any objection to any class holding a North American championship. I was just pointing out what the rules technically are, as they were explained to me.

F18 is an ISAF class, so they have to get the permission of the MNA of the country in which the event is being held, and I assume they have done that. But I don't think any of the MNA's in North America really care that the event is called a North American Championship.

Mary