With the summer travel season underway, fliers snarled by long airport security lines are demanding to know what's behind the delays.
A former top Transportation Security Administration (TSA) official says staffing errors at the agency is to blame.
"TSA has made bad assumptions about the level of personnel resources necessary to process the two million passengers a day that come through," Tom Blank told CNBC's On The Money in a recent interview.
Blank served in senior posts from the agency's founding under the presidential administration of George W. Bush in 2001. He created the TSA's security policy and left in late 2005 after serving as the agency's number two official, and is frequently referred to as one of the agency's "founding fathers."
Blank also pointed to the fact that TSA's estimates of how many travelers would sign up for TSA preliminary screenings, or PreCheck, were way off.
"They assumed that the TSA PreCheck program was going to create enough [efficiency] and speed enough people through that they could do without some three thousand less transportation security officers," he said. Apparently, that assumption has been found wanting.