believed to be motorized paragliders like those seen here. those innocent looking pleasure craft that the suspects may have intended for far deadlier purposes since al qaeda has long been obsessed with arming aircraft. how much explosive substance could you actually put on something look this? you can see underneath the pilot there is room where they could put explosive. or in the past, a suicide vest. carry the explosives on his body and perhaps detonate as he flew into a crowd, flew into a stadium, some place where he could make the terror attack and create fear. reporter: the paraglider would add to the creative lethal bomb delivery systems terrorists have used over the years. there was the printer bomb, the shoe bomb, the underwear bomb. but also used or contemplated, explosives hidden in teddy bears, cameras, laptops, prosthetics including one molded