Forgetting the lessons of 9/11

Jeff Jacoby reminds us of some of the forgotten lessons of 9/11 of which we were reminded by the attempt to bring down Delta 253 in the skies of Detroit and southern Canada last week. To me, this is the key lesson. Terrorists can always adapt to new restrictions. After 9/11, knives and sharp metal objects were banned from carry-on luggage, so Richard Reid attempted to detonate a shoe bomb.