Wino
Nice fact, but the truth is that although it was allowed to carry guns from the Cuban Missile Crisis until 2001 I believe, this was to be done on an airline-by-airline basis (not individual choice), and none signed up. As such, pilots have been fully unarmed for far longer than you imply.
To be honest, 2 pilots vs 4 or more hijackers don't stand a hope in hell: pilots get bundled by more people than they can hope to shoot, and hijackers gain 2 perfectly working guns. Great.