After speaking with several of the airport operators and FAA people here in the Dallas-Fort Worth area, this is what I understand to be accurate. Please post your opinions or any experiences you may have encountered. I would love to hear other points of view. For recreational operations (not commercial), you may fly in Class-B airspace (I only know what that is because I use to fly a small plane) as long as you are not inside the airport or on airport "proper" and if you notify the control tower/airport operator of your flight, AND stay away from manned aircraft giving them the ROW. I was also told that the 400ft rule does not apply to hobbyists. I have also been told that it applies to everyone but you can fly 400 ft above a structure. Lastly, I've read that when you contact the airport to "notify" them of your flight, they can decline your notification. However, the FAA website specifically says that the operator can object to your flight but cannot prohibit you from flying. What are your opinions/understandings on these items?