OK; I feel a lot less comfortable, now. What triggered the question was learning that a bomb in checked baggage destroyed a commercial aircraft departing from here in Denver back in 1955, apparently the second destruction by sabotage of an American commercial aircraft in flight.

But if the screening of checked baggage and cargo is a shot through with weaknesses as appears to be the case, what are we to conclude from the fact there have not been any cargo-hold bombings by al-Qaeda or its minions? Is our safety in that whatever the ineptitude level of TSA may be, it is matched by the failure of terrorist leadership to recognize opportunity?