19 CFR Parts 4 and 122; 6 CFR Part 5: Advance Electronic Transmission of Passenger and Crew Member Manifests for Commercial Aircraft and Vessels; Final Rule [open pdf - 221KB]
"This rule adopts as final, with the modifications set forth in this document, proposed amendments to Customs and Border Protection (CBP) regulations concerning electronic manifest transmission requirements relative to travelers (passengers, crew members, and, in some instances, noncrew members) onboard international commercial flights and voyages arriving in and departing from the United States. The rule is designed to enhance national security and the level of security provided under the regulations for the commercial air and sea travel industries, and consequently increase national security in general. The rule also implements the Intelligence Reform and Terrorism Prevention Act of 2004, which requires that electronic manifest information for passengers onboard commercial aircraft arriving in and departing from the United States, and passengers and crew onboard arriving and departing commercial vessels (with certain exceptions), be vetted by DHS against a government-established and maintained terrorist watch list prior to departure of the aircraft or vessel."
United States. Customs and Border Protection: http://www.cbp.gov/
Federal Register (August 23, 2007), v. 72, no. 163, p. 48320-48345