A deep technical exploration of the aviation booking infrastructure hidden in plain sight on a boarding pass. Covers what a PNR (Passenger Name Record) actually is, why the 6-character locator is not globally unique, how e-ticket numbers serve as the true primary key, and how IATA's fare calculation notation works using the fictional NUC currency. Explains the distinction between GDS locators and airline record locators, decodes segment status codes (HK, XX, TK, etc.), and unpacks the Q surcharge system as accumulated regulatory scar tissue. Draws software engineering lessons about identifier design, multi-currency pricing patterns, and why legacy complexity persists in systems requiring multilateral agreement to change.
Table of contents
What a PNR Actually IsThe Five Mandatory ElementsMy PNR, DecodedThe E-Ticket NumberThe Fare Calculation LineThe Return Fare Line: A Different CurrencyThe Tour CodeLessons LearnedSort: