Four giant airline computer systems in the United States handle nearly all the airline reservations in the country. (They're known as CRSs, for computer reservations systems, or more often now GDS for global distribution systems.) Although each airline has a ``home'' CRS, the systems are all interlinked so that you can, with few exceptions, buy tickets for any airline from any CRS. The dominant systems in the U.S. are Sabre (home to American and US Airways), Galileo (home to United), Worldspan (home to Delta, Northwest), and Amadeus (many European lines.) The company that owned Galileo and Orbitz recently bought Worldspan, so the two GDS will presumably be merged. Many of the low-price start-up airlines don't participate in any of these systems but have their own Web sites where you can check flights and buy tickets. Southwest, the largest and oldest of the low-price airlines, doesn't participate, either. Southwest's web site gets car and hotel info from Galileo, but the info seems not to flow the other way. Orbitz one of the big three online travel agencies, runs its own system which is "direct connect" linked directly to many of the airlines.
The Transportation Security Administration (TSA) of the US Department of Homeland Security requires us to collect information from you for purposes of watch list screening, under the authority of 49 U.S.C. section 114, and the Intelligence Reform and Terrorism Prevention Act of 2004. Providing this information is voluntary; however, if you don't provide it, you may be subject to additional screening or denied transport or authorisation to enter the post-security area. TSA may share information you provide with law enforcement or intelligence agencies or others under its published system of records notice. For more on TSA Privacy policies, or to view the system of records notice and the privacy impact assessment, visit tsa.gov.
The first step to an international trip is to read our Traveler’s Checklist to find out things to consider before you go. Pay special attention to our safety and security information and assess for yourself the risk of traveling to a particular country or region. Some U.S. citizens with special considerations – such as students, women, and LGBTI travelers – may face additional challenges when abroad. If you do decide to travel, make a plan for what to do if something goes wrong overseas. 
Travel by water often provided more comfort and speed than land-travel, at least until the advent of a network of railways in the 19th century. Travel for the purpose of tourism is reported to have started around this time when people began to travel for fun as travel was no longer a hard and challenging task. This was capitalised on by people like Thomas Cook selling tourism packages where trains and hotels were booked together.[10] Airships and airplanes took over much of the role of long-distance surface travel in the 20th century, notably after the second World War where there was a surplus of both aircraft and pilots.[7]
Avoid walking after dark, especially alone, and avoid deserted or under-populated areas. Only go to bars and nightclubs in a group and avoid separating from the group. Avoid excessive alcohol consumption, and do not accept invitations or rides from strangers or recent acquaintances, as these can make you a more vulnerable target for criminals. In cases of sexual assault, police authorities will order a medical examination. 

The first step to an international trip is to read our Traveler’s Checklist to find out things to consider before you go. Pay special attention to our safety and security information and assess for yourself the risk of traveling to a particular country or region. Some U.S. citizens with special considerations – such as students, women, and LGBTI travelers – may face additional challenges when abroad. If you do decide to travel, make a plan for what to do if something goes wrong overseas. 
IMPORTANT NOTICE: Canadians travelling for tourism purposes in a European Union country must hold a passport valid for at least three (3) months beyond the date of expected return from that country (exceptions: United Kingdom and Ireland require a valid Canadian passport only). For sun destinations, the validity period must usually be at least six (6) months beyond the date of expected return. Regulations may vary for non-Canadian passport holders.
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IMPORTANT NOTICE: Canadians travelling for tourism purposes in a European Union country must hold a passport valid for at least three (3) months beyond the date of expected return from that country (exceptions: United Kingdom and Ireland require a valid Canadian passport only). For sun destinations, the validity period must usually be at least six (6) months beyond the date of expected return. Regulations may vary for non-Canadian passport holders.
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