“A warhead filled with ball bearings would destroy any planes in such a hanger.”
Old trucks could be parked behind and in front of the plane.
Jets are aluminum balloons filled with jet fuel, and/or jet fuel/air mixtures. Poking a hole in one with a small bit of steel is a problem. Minimally, some serious maintenance will be requited to assess their airworthiness. A spark, and it’s “Good night, nurse.”