This e-supplement is a companion to our report entitled "Transportation Security Information Sharing: Stakeholders Generally Satisfied but TSA Could Improve Analysis, Awareness, and Accountability," GAO-12-44 Section 1203 of the Implementing Recommendations of the 9/11 Commission Act of 2007 directed GAO to survey transportation stakeholders regarding the security-related information products they receive [Pub. L. No. 110-53, 1203(a), 121 Stat. 266, 383-85 (2007) (codified at 49 U.S.C. 114(u)(7)).]..