Do you recall the incident several weeks ago of the low-flying plane circling the center of Gettysburg, PA- for 2 hours early one morning?
The plane was not intercepted and, TTBOMK, was never found.
POSSIBLE TEST RUN FOR HARRISBURG/PHILLY?
Also, remember in Instanbul a terrorist was arrested
and told authorities of his plan to fly a glidder laden
with explosives into a hotel there were President was
staying for the NATO confrence.
Glidders, Hot Air Balloons, Weather Balloons or Parachutes
are not picked up by radar.