How come none of the 19 terrorist’s names appeared on the original passenger lists released by both United Airlines and American Airlines?

Photo: Two men identified by authorities as suspected ... more 
How come none of the 19 terrorist’s names appeared on the original passenger lists released by both United Airlines and American Airlines?

Photo: Two men identified by authorities as suspected hijackers Mohammed Atta (R) and Abdulaziz Alomari (C) pass through airport security September 11, 2001 at Portland International Jetport in Maine in an image from airport surveillance tape released September 19, 2001. Authorities say the two men took a commuter flight to Boston before boarding American Airlines Flight 11, which was one of four jetliners hijacked on September 11 and one of two which were crashed into New York's World Trade Center. (CREDIT REUTERS/PORTLAND POLICE DEPARTMENT-Handout) less 
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Fri, Sep 9, 2011 1:56 PM EDT