Past is Gone. Now?
How about the future? What will change? Henceforth, ALL planes need to have an I.D. broadcasting at ALL TIMES whilst in the air, and NOT under the control of the cockpit. This will not only discourage future events of this kind, but will serve PAX with the comforting knowledge that never again will they be at the mercy of terrorists, mentally challenged pilots, or disorganized authority. The technology has existed for a long long time, and that it has never been used is unforgivable.