scope:

BACKGROUND.

Immediately following the 9/11 attacks, the Federal Aviation Administration (FAA) security, and subsequently the Transportation Security Administration (TSA), markedly increased the number and scope of Sensitive Security Information (SSI) documents issued as a means of notifying specific segments of the air carrier industry, airports, and air operators of the current threat to U.S. civil aviation. Often, SSI documents have required implementation of specific measures by any aircraft operator covered by Title 49 of the Code of Federal Regulations (49 CFR) part 1544, § 1544.101(a) conducting scheduled and/or public charter flight operations from or within the United States or its territories.