I believe this question goes in this particular forum.. I live outside Charlotte, NC. Charlotte's Class B airspace goes out 7NM, SFC-100. The way I am reading the rules is if I fly recreationally I dont have't to notify the tower unless Im within 5SM of the airfield. But flying within 7NM (or 8SM) of the airfield, Im in Class B SFC-100. I think the correct thing to do even as a recreational flyer would be to notify the tower if Im outside 5SM but within 8SM. What do you all believe?