1: The size of the SFRA airspace is designed to be large enough to give our defense forces enough time to determine if a threat exists from an aircraft entering it , an opportunity to identify the threat , and if necessary , to divert or eliminate it . 2: So how does a flying machine that looks like a sophisticated lawn chair with helicopter blades invade such highly restricted airspace , as happened Wednesday , when a postal carrier from Florida landed a single-person aircraft on Capitol grounds ? 3: Les Abend : How did gyrocopter fly on to Capitol grounds when FAA , defense forces keep tight rein on airspace ?
1: the SFRA airspace 2: such highly restricted airspace 3: airspace