Anatomy of a PNR: the 6-char booking reference that hasn't changed since 1975(ajitem.com)
ajitem.com
Anatomy of a PNR: the 6-char booking reference that hasn't changed since 1975
https://ajitem.com/blog/iron-core-part-2-six-characters/
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https://ajitem.com/blog/iron-core-part-2-six-characters/
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