Jpe61 opines that in certain circumstances aircraft can be denied services because of overdue fees. One service mentioned is ATC. This makes me curious if this could actually happen, since for certain airspaces ATC is federally required. (For ex., can't take off from a Class B without clearance.)
Can federally-mandated ATC services be denied in isolation (i.e. not as a result of revoking a license or permit), and, if so, are there instances of this occurring?