Never say never but, WRT nuclear power plants... http://en.wikipedia.org/wiki/Containment_building http://en.wikipedia.org/wiki/Containment_building "In 1988,

Never say never but, WRT nuclear power plants... http://en.wikipedia.org/wiki/Containment_building http://en.wikipedia.org/wiki/Containment_building "In 1988, Sandia National Laboratories conducted a test of slamming a jet fighter into a large concrete block at 481 miles per hour (775 km/h). The airplane left only a 2.5-inch-deep (64 mm) gouge in the concrete. Although the block was not constructed like a containment building missile shield, it was not anchored, etc., the results were considered indicative. A subsequent study by EPRI, the Electric Power Research Institute, concluded that commercial airliners did not pose a danger." WRT prisons, landing with an airplane is going to be challenging (minimum landing distance is 500m) and taking off is likely impossible (minimum take-off distance is 520m[1]). Given the improbability of leaving the prison, it will be a self-correcting issue. ;-) [1] http://www.aircraftcompare.com/helicopter-airplane/Terrafugia-Transition/289 http://www.aircraftcompare.com/helicopter-airplane/Terrafugi...