PNR means passenger Name record
The concept of PNR was first used by air carriers to exchange information on passengers. Part of the passenger data is exchanged, but most airlines (airlines, ticket services, etc.) also enrich the PNR with other information that is of interest to them. Nowadays it is also used when booking hotels, car rental, etc. For a fly PNR you should remember the personal contact details, the itinerary, but also meal preference, or seat preference.
Security vs. Privacy–which passenger data can be accessed? YouTube Yi0-2u8XoDY [/youtube]