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                                                                                               January 15, 2021

Aviation Security Measures and Domestic Terrorism Threats


After the January 6, 2021, security breach of the United
States Capitol, some Members ofCongress have advocated
restricting the air travelof individuals who may seek to
incite or carry out further violence. The Federal Bureau of
Investigation (FBI) is reportedly considering placing
individuals who illegally entered the Capitolon the
Transportation Security Administration (TSA) No -Fly List.
This In Focus discusses the circumstances under which air
carriers, TSA, and other federal authorities may restrict
domestic airline travel in response to security threats.

The  No-Fly  List and Airline Passenger  Prescreening
The No-Fly List is one of severallists maintainedby TSA
to identify passengers based on their risk to aviations afety
and national security (See 49 U.S.C. §44903). As the name
implies, individuals onthe No-Fly List are to be denied
boarding and referred to law enforcement authorities when
they arrive at an airport to checkin for a commercial airline
flight. In addition to theNo -Fly List, TSA maintains lists of
individuals who are to receive special scrutiny during pre-
flight security screening and whose carry-on bags and
checked baggage are to be examined more thoroughly. The
primary list of such individuals is referred to as the Selectee
List or Automatic Selectee List to indicate that these
individuals are to be automatically selected for enhanced
screening. Enhanced screening may include measures such
as pat-downs and chemicaltrace detection swabs to test for
explosives residue. Passengers not on these lists may be
randomly s elected for enhanced screening, and passengers
or baggagethattrigger alarms during initial screening may
also undergo these additional measures.
Both the No-Fly and Selectee lists are subsets of the
broader consolid ated terroris t watchlis t, formally known as
the Terrorist Screening Database or TSDB. The TSDB is
maintained by the FBI's Terrorist Screening Center, which
is responsible for consolidating and disseminating terrorism
data to federal, state, and local law enforcement, and
international partners. TSA's Secure Flight systemchecks
passenger names against these lists multiple times between
ticket purchase and the flight's departure, as the lists are
routinely updated. TSA may expand these Secure Flight
checks to include the larger number of identities in the
complete TSDB  when  warrantedby security conditions.
This can be done when specific threat intelligence suggests,
for example, heightened security concerns regarding a
specific flight, flights along a specific route, flights froma
certain region, or flights to a specific destination. TSA
sometimes refers to this broader useof the complete TSDB
as the Expanded Selectee List, suggesting that, under such
heightened security conditions, additional individuals may
be selected for enhanced security screening. However, the
No-Fly list might not be expanded unless specific
information warrants inclusionof additionalindividuals on
that list.


In addition to the Selectee list, TSA relies on sets ofrules to
temporarily assign certain passengers to two other lists it
maintains, the Silent Partner and Quiet Skies lists.
Individuals may be placed onthese lists based on their
recent international travelpatterns, and are subject to
enhanced screening measures, including additional baggage
screening, for a period of time.
Historically, the TSA lists and the broader TSDB have
focus edmainly on international terrorist threats. The FBI
most recently released data about its security lists in
September 2011. At that time, about 98% of the roughly
420,000 identities contained in the TSDB referred to
persons who were notU.S citizens orlegalU.S. residents.
The No-Fly list then consisted of about 16,000 identities, of
which fewer than 500 referred to U.S. persons. The Selectee
list was said to also contain about 16,000 identities,
although theFBIdid not specify how many of those were
U.S. persons. TheTSDB  apparently has grown
considerably since then. According to press reports, about
1.2 million people were on the watchlist in 2017, including
about 4,600 American citizens. Official updates regarding
the size and scope of the No-Fly and Selectee lists,
however, have notbeen made public.
TSA  was required to establish a procedural mechanism
enabling people to challenge their inclusion on theNo -Fly
list or other lists that effectively barred themfromtraveling
by air. The Department of Homeland Security's Traveler
Redress Inquiry Program(TRIP) maintains a website
through which individuals who claimto have been
misidentified may seekredress, but such individuals may be
barred fromair travelor subjectto enhanced screening until
their cases are adjudicated.

Airline Blacklists
Airlines' contracts ofcarriage, to which passengers agree
when  they purchase tickets, oblige passengers to obey
airline rules and policies and comply with crewmembers
performing their duties. Airlines may refuse to provide
service to individuals who refuse to wear masks or facial
coverings for the duration of the flight, as airlines have
uniformly required in response to federal recommendations
to limit the spread of COVID-19. Airlines may also remove
disruptive or uncooperative individuals froman airplane,
and may ban themfrom  future flights. Airlines are not
obligated to notify the Federal Aviation Administration
(FAA), TSA,  other federal agencies, or other airlines of
individuals who have been banned fromfuture flights. If
incidents are brought to their attention, however, FAA or
TSA  may investigate to determine whether individuals may
have violated federal aviation s afety or security regulations.

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