Should we be concerned? - Absolutely!!!
There were dry runs that ran up to the the 9/11 attacks.
Now it appears that terrorists are running dry runs again on our airplanes so that they can test out just how soft a target our skies are now.
Here's a link to the Reuters's report, U.S. airports warned of possible attack "dry runs":
In at least four incidents over the past year, security screeners have found items in carry-on luggage -- blocks of cheese taped to electrical components, for example -- that resembled homemade bombs, according to the TSA's July 20 memo.
"Past terrorist attacks and plots show that such testing generally indicates attacks will soon follow," said the internal memo, which was posted on the Internet by NBC News on Tuesday.
We need to be on high alert as citizens.
Here is a video of actor James Woods detailing the dry run he experienced on a plane pre-9/11 that included at least two of the Islamic terrorists of 9/11.