Pan Am 103 was but one in a long string of terrorist attacks against civilian aircraft throughout the 1970s and 1980s. Despite what many young Americans seem to think, aircraft sabotage did not begin with the attacks of Sept. 11, 2001. It has been with us for decades (see a list of them). But through it all, and despite our intoxication with security, we have still not adequately confronted the danger. On the contrary, our obsession with the events of 9/11 has left us vulnerable.

The novelty of the Sept. 11 attacks notwithstanding, the primary threat to commercial planes is, was and shall remain the smuggling aboard of explosives, which is what happened on Pan Am 103. The bomb came onboard in a suitcase. The hijack paradigm changed forever on 9/11, rendering the inflight takeover concept unworkable for a terrorist.

In any case, and in spite of the Transportation Security Administration's best efforts, there are limitless ways to sneak knives and other dangerous materials past guards; not to mention, a deadly weapon can be fashioned from just about anything, including plenty of materials found on airplanes. (I'll point out that even maximum-security prisons are unable to eliminate knives and contraband.) Yet whether by virtue of incompetence or willful ignorance, TSA continues to waste untold time and untold millions of dollars on a tedious, zero-tolerance fixation with blades and sharps. This does nothing to make us safer, and in fact draws security resources away from worthy pursuits.