
Airport police units are a security police agency assigned to perform law enforcement functions at airports. They provide a wide range of law enforcement duties and responsibilities including patrol, investigation, traffic flow management, and control and response to airport emergencies. Airport police provide enhanced safety to airport employees, and to passengers. Officers can be found at security gates, throughout the terminal area, and around the airport’s perimeter.

Backscatter X-ray is an advanced X-ray imaging technology. Traditional X-ray machines detect hard and soft materials by the variation in x-ray intensity transmitted through the target. In contrast, backscatter X-ray detects the radiation that reflects from the target. It has potential applications where less-destructive examination is required, and can operate even if only one side of the target is available for examination.

The Canadian Air Transport Security Authority is the Canadian Crown Corporation responsible for security screening of people and baggage and the administration of identity cards at the 89 designated airports in Canada. CATSA is answerable to Transport Canada and reports to the Government of Canada through the Minister of Transport.

Covenant Aviation Security, LLC (CAS) is a Chicago company that provides security services to the aviation industry. Michael Bolles has been its President since July 2012.

"Don't touch my junk" is a phrase that became popular in the United States in 2010 as a criticism of Transportation Security Administration (TSA) patdowns. The word "junk" is American English slang for a man's genitals. The phrase refers to the offense many people took to the November 2010 decision by TSA to begin full body patdowns of airline passengers in the U.S. who refused to go through a full body scanner.
The Registered Traveler Pilot Program was an airline passenger security assessment system tested in the United States air travel industry in 2005. It was used in several U.S. airports in a voluntary pilot phase and continues in operation in several airports around the country. It is administered by TTAC, the Transportation Security Administration (TSA) office responsible for Secure Flight, the replacement for the Computer Assisted Passenger Prescreening System (CAPPS) and the canceled CAPPS II counter-terrorism system. Registered Traveler is a public and private partnership between the TSA and the Registered Traveler Interoperability Consortium (RTIC) providing rules and standards for private Enrollment Providers that sign up participants. At 11:00 p.m. PST on June 22, 2009, Clear ceased operations because Clear and its parent company, Verified Identity Pass, Inc., filed for bankruptcy. The company was then acquired by Alclear LLC and "Clear lanes" were opened at Denver International Airport, Orlando International Airport, Dallas/Fort Worth International Airport, and San Francisco International Airport. Clear is currently operating at 60 airports, airports, stadiums, and other venues nationwide as of January 2020.

Secondary Security Screening Selection or Secondary Security Screening Selectee, known by its initials SSSS, is an airport security measure in the United States which selects passengers for additional inspection. People from certain countries are subject to it by default. The passengers may be known as Selectee, Automatic Selectee or the Selectee list. The number of names on the list fluctuates and is a secret, although the Transportation Security Administration apparently says there are tens of thousands of names on it.
Airport security refers to the techniques and methods used in an attempt to protect passengers, staff, aircraft, and airport property from accidental/malicious harm, crime, terrorism, and other threats.

Sensitive Security Information (SSI) is a category of sensitive but unclassified information under the United States government's information sharing and control rules. SSI is information obtained in the conduct of security activities whose public disclosure would, in the judgement of specified government agencies, harm transportation security, be an unwarranted invasion of privacy, or reveal trade secrets or privileged or confidential information. SSI is governed by Title 49 of the Code of Federal Regulations (CFR), parts 15 and 1520.
An X-ray generator is a device that produces X-rays. Together with an X-ray detector, it is commonly used in a variety of applications including medicine, X-ray fluorescence, electronic assembly inspection, and measurement of material thickness in manufacturing operations. In medical applications, X-ray generators are used by radiographers to acquire x-ray images of the internal structures of living organisms, and also in sterilization.