I think it is one big system, or moving that way. TSA's precheck is part of it.
http://www.globalentry.gov/On Oct. 4, 2011 the Transportation Security Administration (TSA) launched an expedited screening pilot program called . CBP has partnered with TSA on this Department of Homeland Security initiative, which is designed to help TSA focus resources on higher-risk and unknown passengers while expediting the process for lower-risk and known passengers whenever possible.
U.S. citizens who are members of the U.S. Customs and Border Protection (CBP) Global Entry, NEXUS, and SENTRI Trusted Traveler programs are eligible to participate in TSA's program.http://www.tsa.gov/what_we_do/escreening.shtmRisk-Based Security Initiative
Home | How it Works | Participation | Frequently Asked Questions
TSA Pre✓™ is an expedited screening initiative that is expanding to airports across the country. Implementing a key component of the agency’s intelligence-driven, risk-based approach to security, TSA Pre✓™ enhances aviation security by placing more focus on pre-screening individuals who volunteer to participate in order to expedite the travel experience.
TSA is partnering with U.S. Customs and Border Protection (CBP) as well as U.S. air carriers as part of this pre-flight screening initiative. Certain frequent flyers from Delta Air Lines, American Airlines and certain members of CBP's Trusted Traveler programs, including Global Entry, SENTRI, and NEXUS who are U.S. citizens are eligible to participate.
Passengers who are flying on Delta out of Hartsfield-Jackson Atlanta International, Detroit Metropolitan Wayne County, Las Vegas’ McCarran International, Minneapolis-St. Paul International and Salt Lake City International airports or on American out of Dallas/Fort Worth International, Las Vegas’ McCarran International, Miami International Los Angeles International and Minneapolis-St. Paul airports are eligible to participate, which could qualify them for expedited screening at select checkpoints.
TSA Pre✓™ is currently available for eligible participants, who have opted in at the following airport checkpoint locations:
Atlanta (ATL): T-South Checkpoint (Delta only)
Dallas (DFW): Terminal C, Checkpoint C30 (American only)
Detroit (DTW): Checkpoint 2 on the ticketing level (Delta only)
Las Vegas (LAS): D Gates First Class Checkpoint (American and Delta)
Los Angeles (LAX): TSA Pre✓™ screening lane (American only)
Miami (MIA): D2 Checkpoint (American only)
Minneapolis (MSP): Lindbergh Terminal, Checkpoint 4 (American and Delta)
Salt Lake City (SLC): Terminal 2 Checkpoint (Delta only)
American will begin at John F. Kennedy International Airport (JFK) on February 28.
In March, TSA Pre✓™ will expand to Ronald Reagan Washington National Airport (DCA) for qualified participants flying on Delta and to Chicago’s O’Hare International Airport (ORD) for participants flying on American.
In 2012, TSA plans to expand TSA Pre✓™ for eligible passengers flying on participating airlines at the following airport locations:
Baltimore/Washington International Thurgood Marshall Airport (BWI)
Boston Logan International Airport (BOS)
Charlotte Douglas International Airport (CLT)
Cincinnati/Northern Kentucky International Airport (CVG)
Denver International Airport (DEN)
Fort Lauderdale-Hollywood International Airport (FLL)
George Bush Intercontinental Airport (IAH)
Honolulu International Airport (HNL)
Indianapolis International Airport (IND)
John F. Kennedy International Airport (JFK)
LaGuardia Airport (LGA)
Lambert-St. Louis International Airport (STL)
Louis Armstrong New Orleans International Airport (MSY)
Luis Muñoz MarÃn International Airport (SJU)
Newark Liberty International Airport (EWR)
O’Hare International Airport (ORD)
Orlando International Airport (MCO)
Philadelphia International Airport (PHL)
Phoenix Sky Harbor International Airport (PHX)
Pittsburgh International Airport (PIT)
Portland International Airport (PDX)
Ronald Reagan Washington National Airport (DCA)
Salt Lake City International Airport (SLC)
San Francisco International Airport (SFO)
Seattle-Tacoma International Airport (SEA)
Tampa International Airport (TPA)
Ted Stevens Anchorage International Airport (ANC)
Washington Dulles International Airport (IAD)
TSA plans to continue expanding the TSA Pre✓™ concept to include additional airlines, as well as airports that participate in CBP’s Global Entry program, once operationally ready.
TSA will always incorporate random and unpredictable security measures throughout the airport and no individual will be guaranteed expedited screening in order to retain a certain element of randomness to prevent terrorists from gaming the system.
Airport security checkpoints are only one part of a multi-layered system for aviation security. Other parts, both seen and unseen by the public, include intelligence gathering and analysis, behavior detection officers, explosives detection canine teams, federal air marshals, and closed-circuit television monitoring.
Additional changes to the screening process may be implemented in the future as TSA continues to analyze the best approaches to security.