ORIGINAL: Sport_Pilot
There is no such thing as "our airspace" when it pertains to models.
Helicopters aside, airspace below 1200, 1000, or 500 feet, and near airports 250 feet is our space as the full scale airplanes should not be there. Not specifically for models but for kites, ballons, toys, etc.
This statement indicates a fundamental lack of understanding of how the US Airspace System is set up and operated. Until you truly grasp what the FAA does with respect to airspace, then you will continue to have incorrect ideas about how that relates to model aircraft.