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A carrier’s operator or authorized travelagent logs into the CRS/GDS to build a PNR file with five mandatory elements (to be discussed later in the section about PNR data). If, for example, a travelagent uses Amadeus to book a flight operated by a Sabre-hosted carrier, there will be at least two PNRs with their own record locators.
Travel business and PCI DSS compliance levels In 2017, the International Air Transportation Association (IATA) officially supported the initiative declaring that their internal electronic system — Billing and Settlement Plan (BSP) — is compliant with PCI DSS.
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