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Booking codes were defined by [[International Air Transport Association|IATA]],{{cn|date=February 2018}} but airlines have deviated from the IATA standard and current booking codes are airline-specific.<ref name="gal12">{{cite book | title=Galileo 360(degrees). V1 Course book. Galileo Travelport. 2009. | page=12}}</ref> The same code may have different meanings for tickets issued by different airlines. Many airlines use nearly all letters of the alphabet to allow finer yield management. Nevertheless, certain booking codes have retained the same meaning across most airlines:
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== Multiple fare basis ==
It is common for a multi-sector air ticket to have more than one fare basis, particularly if it is for carriage on more than one airline, or different classes of travel are involved. The issuing airline may often have an interline agreement to allow other airlines on the ticket. One disadvantage of this system is that if any change is made, the most restrictive fare rule, and/or the highest change fee, may apply to the entire ticket, not just the portion being changed.<ref>{{cite web |url=http://businesstravel.about.com/od/faqs/g/Glossary-Fare-Basis.htm |title=What is a Fare Basis (or fare code)? |publisher=Businesstravel.about.com |date=2014-03-03 |access-date=2014-04-24 |archive-date=2014-04-12 |archive-url=https://web.archive.org/web/20140412165100/http://businesstravel.about.com/od/faqs/g/Glossary-Fare-Basis.htm |url-status=dead }}</ref>
== Global Distribution Systems ==
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