Evidently the pilot of a commercial aircraft shot a hole through the fuselage of his own aircraft. News stories state "the pilot of a US Airways plane may have mishandled a firearm that went off in flight, piercing a hole in the cockpit wall, a federal air marshal said Tuesday."
The article further states that "pilots in the program undergo 50 hours of training at the federal Law Enforcement Training Center in Artesia, N.M. Alter said it appears the pilot of the US Airways flight wasn't following "proper procedures. ... We just don't know exactly what procedure wasn't being followed."
I am going to go out on a limb here and state that the procedure most obviously NOT followed was the one where pilots aren't supposed to shoot guns a their own airplanes. Evidently, this incident is being investigated by the same crack law enforcement team that cracked the Kennedy assissination. Read the rest here.