President Obama has signed off on new security protocols for people flying to the United States, establishing a system that uses intelligence information and assessment of threats to identify passengers who could have links to terrorism. The system, which will be put in place this month, applies only to travelers flying into the United States. Officials said intelligence information from a variety of United States agencies would be made available to foreign airlines, whose employees and security officials would have wide latitude to stop passengers, or not. Currently, the only information typically checked before a passenger boards an airplane is the name, date of birth and nationality - information found in a passport, which is compared against the terror watch lists. But the Homeland Security Department separately already collects much more information on the travel patterns of passengers headed to the United States, including other stops made on the way to an American airport, how the passenger paid for the ticket as well as other details contained in the reservation, like what hotel a passenger might be staying in, or if he or she is traveling alone.