FILE - In this Jan. 4, 2010 file photo, TSA officer Robert Howard signals an airline passenger forward at a security check-point at Seattle-Tacoma International Airport in SeaTac, Wash.

 

              FILE - In this Jan. 4, 2010 file photo, TSA officer Robert Howard signals an airline passenger forward at a security check-point at Seattle-Tacoma International Airport in SeaTac, Wash.
FILE - In this Jan. 4, 2010 file photo, TSA officer Robert Howard signals an airline passenger forward at a security check-point at Seattle-Tacoma International Airport in SeaTac, Wash. The head of the Transportation Security Administration on Thursday, March 14, 2013 told lawmakers he stands by his plan to allow passengers to carry small knives onto planes despite a growing backlash against the proposal. (AP Photo/Elaine Thompson, File)