Charlie In a Box & 100% Screening After the air cargo security measures were put into place after 9/11, most of the security measures for 100% screening were placed on the flights carrying passengers and cargo. Almost 20 years later, measures are moving forward under new TSA regulations that will require 100% screening on international freighter flights departing the United States. All Cargo Plus One The U.S. security measures on freighters have been more concerned about keeping people off the main deck that might be able to overtake the cockpit crew. Charlie Shipped Himself Air Cargo E-tu Charlie— Charlie the stowaway flew aboard a Kitty