Yeah right, with F16's hovering over him. All they have to do is fly in front of him and tell the FAA where the wreckage is. I could do a lot more damage with a 3000 lb car than a 1200 lb plane.
Of course you ignore the fact that airplanes have access to places a car can't go - the tanks in an oil farm, the dome of a capitol building, an office tower, the catalytic towers in a refinery, the stadium of a county fair. Loaded with appropriate explosive material, the damage it could do could make a car bomb pale in comparison. Escorting F-16's are at a serious disadvantage. The Cessna can stay in the air at speeds that the F-16's lose control. A Cessna flying at 1500' can drop and crash a target before the F-16's can circle to make a pass - much less radio for final clearance to engage!
Your pre-Wright-Brothers mentality is curious.