Actually Buzz, operating an unregistered aircraft was the only felony offense he was charged with: "the 61-year-old advocate for campaign finance reform appeared in U.S. District Court in Washington, charged with violating registration requirements involving an aircraft, which is a felony"
The airspace violations were a misdemeanor: "also was charged with a misdemeanor count of violating national-defense airspace."
Interestingly, some here are advocating doing the same thing - operating an overweight ultralight which would be an unregistered aircraft.