SSI got its start in the Air Transportation Security Act of 1974 (Pub. L. No. 93-366), which, among other things, authorized the Federal Aviation Administration (FAA) to prohibit disclosure of information obtained whose disclosure would constitute an unwarranted invasion of personal privacy; reveal trade secrets or privileged or confidential commercial or financial information obtained from any person; or would reduce the safety of passengers — all notwithstanding the Freedom of Information Act. On June 28, 1976, FAA published a proposal to create Title 14 Code of Federal Regulations (CFR) Part 191 entitled "Withholding Security Information from Disclosure under the Air Transportation Security Act of 1974." Part 191 created the category of sensitive but unclassified information now known as Sensitive Security Information (SSI), and described the information to be protected from disclosure, including "the security program of any airport; the security program of any air carrier; any device for the detection of any explosive or incendiary device or weapon; and, any contingency security plan."