<font face="Verdana, Arial, Helvetica, sans-serif" size="2">The unidentified driver told his interrogators that he was ordered by his al Qaeda bosses to obtain tools that could be used to loosen bolts on a suspension bridge.
The driver also revealed a plan, possibly using cargo trucks, to drive under the belly of a passenger jet without causing suspicion and blow it up.</font>
http://www.nypost.com/news/nationalnews/76641.htm
Why bother with a truck? The fencing around most U.S. airports couldn't stop a Yugo!
Meanwhile, back at the upper level of your favorite airport:
"OFF with your SHOES, Citizen!"