United States Border
Preclearance
United States Border Preclearance
is the United States Department of Homeland Security's practice of operating
Prescreening Border Control Facilities at Airports and other Ports of Departure
located outside of the United States pursuant to agreements between the United
States and Host Countries.
Travelers are subject to
Immigration and Customs Inspections by Customs and Border Protection Officers
before boarding their transportation onward to the United States.
Preclearance applies to all
Passengers (Americans and Foreigners) regardless of their Nationality or
purpose of travel.
Upon Arrival, Precleared
Passengers arrive in the United States as Domestic Travelers, but may still be
subject to re-inspection at the discretion of American Customs.
The Preclearance Agreement is
fully reciprocal, meaning Canada is allowed to operate Preclearance Facilities
in the United States on the same basis as U.S. Facilities in Canada, including
CBSA Agents’ expanded powers under the 2019 Agreement.
As of 2025, Preclearance has not
been exercised by the Canadian Government.
History of Preclearance:
American Prescreening Border
Control in other Countries began in 1894 when American Immigration Inspections
were deployed to Sea Ports in Canada (Montreal, Quebec; Quebec City,
Quebec; Halifax, Nova Scotia and Saint
John, New Brunswick.)
Once admitted, Americans and
Foreigners would be given Documentation to physically cross the Land Border by
train within 30 days without additional Inspection.
In 1903, the Pre-Inspection by
the U.S. Bureau of Immigration, was extended to Victoria, British Columbia for
U.S.-Bound Travelers before boarding their ship to destinations in Washington
State.
Modern US Preclearance was
introduced, at the request of American Airlines, in 1952 at Malton Airport
(today Toronto Pearson International Airport) and Calgary International Airport
both in Canada.
Over 250,000 Passengers were
processed in the first year of Preclearance.
In 1957, Dorval Airport (now
Montreal-Trudeau International Airport) was added to US Preclearance.
By 1970 the 3 US Preclearance
Airports in Canada (Toronto, Calgary and Montreal) were processing 3 Million
Travelers every year.
In 1970 US Preclearance was
opened in its first Non-Canadian Airport on the British Colony of Bermuda.
In 1974, US Preclearance
operations became formalized under Domestic Canadian Law with the passage of
the Air Transport Preclearance Act.
In 1974 the Lynden Pindling
International Airport in Nassau, the Bahamas was added.
In 1979 the Grand Bahama
International Airport in Freeport, the Bahamas was added.
In 1979, the Vancouver and Winnipeg Airports in Canada
were added.
In 1982, the Edmonton Airport was
added.
US Pre-Inspection for Immigration
(but not for US Customs) opened in Shannon Airport in Ireland in 1988 and at
the Dublin Airport in Ireland in 1994
In 1994, the Queen Beatrix
International Airport in Aruba was added.
In 1997, Ottawa Airport in Canada
was added.
In 1999, The Preclearance Act
modernized the Process.
In 2001, Preclearance was updated
by the Canada–U.S. Agreement on Air Transport Preclearance.
In 2006, Halifax Airport in
Canada was added.
In 2011, the Shannon Airport and
the Dublin Airport in Ireland were added as full US Preclearance.
In 2014 the Abu Dhabi
International Airport in the United Arab Emirates was added.
In 2019, The Agreement on Land,
Rail, Marine, and Air Transport Preclearance Between the Government of the
United States of America and the Government of Canada was signed.
Implementation of US
Preclearance:
In Airports with Preclearance,
Passengers must first pass Airport Security Inspection before they can proceed
to the Preclearance Area.
Security Checks are conducted by
Canadian Air Transport Security Authority (CATSA) in the standards of both
CATSA and U.S. Transportation Security Administration (TSA) Regulations.
Travelers who have passed through
Preclearance Facilities, but whose flight or ship has not departed, remain in
the legal jurisdiction of the Host Country.
U.S. Officials may question and search
Travelers with such Passengers' permission. Their power to arrest or detain
Travelers (such as for Customs or Immigration Violations or Outstanding
Warrants) is limited.
Passengers can choose to abandon
their flight and refuse search, and unlike in the United States, US Officers
cannot search them without permission absent an immediate threat.
Preclearance Issues:
In 2013, when a departing Airplane full of
already-Precleared Passengers in Toronto, Canada couldn’t obtain Takeoff
Clearance due to worsening weather conditions and was forced to return to the
Gate rather than fly to New York the American and Canadian Officials argued
over what to do, the final compromise was that anyone who wished to stay in
Toronto had to pass through Canadian Customs and anyone who wished to continue
to New York on a later flight had to pass through US Preclearance again.
Current US Preclearance
Locations:
Aruba: Queen Beatrix
International Airport
The Bahamas: Lynden
Pindling International Airport in Nassau
Note: US Preclearance at
the Grand Bahama International Airport of Freeport, the Bahamas was closed in
2022 due to construction at the Airport. It is unknown when it will return.
Bermuda: L.F. Wade
International Airport
Canada:
The following Canadian Airports
operate U.S. Preclearance Facilities:
Calgary International Airport
Edmonton International Airport
Halifax Stanfield International
Airport
Montréal–Trudeau International
Airport
Ottawa Macdonald–Cartier
International Airport
Toronto Pearson International
Airport
Vancouver International Airport
Winnipeg James Armstrong
Richardson International Airport
Note: US Preclearance
Facilities are currently being constructed at the Toronto Island Airport and
Quebec City Jean Lesage International Airport and are expected to open soon.
US Preclearance Facilities for
Rail Passengers in Canada:
There are currently no full
Preclearance Facilities for Rail Passengers in Canada.
Since 1995, Pre-Inspection for
Immigration (but not for Customs) has been carried out at the Pacific Central
Station in Vancouver, British Columbia for Passengers departing on the Amtrak
Cascades trains to Seattle and Portland, Oregon.
US Preclearance Facilities for
Sea Passengers in Canada:
In 2022, US Preclearance was
opened at the Prince Rupert Alaska Marine Highway System Ferry Terminal in
Prince Ruper, British Columbia.
US Pre-Inspection for
Immigration (but not for US Customs) in Canada:
The Port of Victoria, British
Columbia for both the Black Ball Line's MV Coho Car Ferry Service to Port
Angeles, Washington and the Victoria Clipper Passenger-Only Ferry to Seattle,
Washington.
The Ferry Terminal in Sindey,
British Columbia for the Washington State Ferries' Anacortes–San Juan Islands
Ferry Service to Anacortes, Washington.
The Port of Vancouver in British
Columbia for Travelers on Cruise Lines that visit Alaska.
US Preclearance Statistics:
Today US Preclearance has 600
Immigration Officers and Agriculture Specialists stationed at 15 Preclearance
Locations and US Immigration and Customs Officers have Precleared 27 Million
Travelers (or 16% of all Commercial Travelers to the US.)
Possible Expansion of US
Preclearance:
Brussels Airport, Belgium
Punta Cana Airport, the Dominican
Republic
Narita International Airport,
Japan
Amsterdam Airport Schiphol, the
Netherlands
Oslo Airport, Norway
Madrid-Barajas Airport, Spain
Stockholm Arlanda Airport, Sweden
Istanbul Airport, Turkey
London Heathrow Airport, the
United Kingdom
Manchester Airport, the United
Kingdom
El Dorado International Airport
(BOG) in Bogota, Colombia
Ministro Pistarini International
Airport (EZE) in Buenos Aires, Argentina
Edinburgh Airport (EDI) in
Edinburgh, the United Kingdom
Keflavik International Airport
(KEF) in Iceland
Mexico City International Airport
(MEX) in Mexico City, Mexico
Milan-Malpensa Airport (MXP) in
Milan, Italy
Kansai International Airport
(KIX) in Osaka, Japan
Rio de Janeiro-Galeão
International Airport (GIG) in Rio de Janeiro, Brazil
Leonardo da Vinci-Fiumicino
Airport (FCO) in Rome, Italy
São Paulo-Guarulhos International
Airport (GRU) in São Paulo, Brazil
Princess Juliana International
Airport (SXM) in St. Maarten.
Note: I have been through
US Preclearance in Aruba; Nassau, the Bahamas; Toronto, Canada and Montreal,
Canada.