Transportation Secretary Norman Mineta has based airline security on three policies: improved screening, air marshals, and strengthened cockpit doors. While all are helpful, no one can ignore the evidence from the last couple of weeks that all three policies are simply not enough. If the administration is going to be serious about keeping terrorists out of the cockpit, Mineta and Homeland Security chief Tom Ridge need to being considering something they have long resisted — arming pilots.Six months after September 11th, the Washington Post reported that there were fewer than 1,000 U.S. Air Marshals, possibly a lot fewer, but...