Six Characters
2 days ago
- #travel-infrastructure
- #IATA-systems
- #aviation-technology
- PNR locators like DDTCIV are six-character codes unique within a GDS (Global Distribution System) but not globally unique across all systems, so airlines maintain separate record locators.
- An e-ticket number (e.g., 098-5801178359) is the primary key for a booking, stable across flight changes, while the PNR can change.
- Fare calculation lines use a 1970s IATA notation with Neutral Unit of Construction (NUC), a currency-neutral unit, to handle multi-currency pricing and exchange rate fluctuations.
- The NUC system allows fares to be quoted consistently by converting to local currency at ticketing, and includes Q surcharges for specific routing combinations.
- IATA Recommended Practice 1830 defines five mandatory PNR elements: name, flight, contact, ticketing status, and audit trail; optional details like passport or payment are not required.
- Tour codes in PNRs (e.g., BOM/MMTCZ) link corporate accounts across airlines, travel agents, and financial systems for billing and negotiated rates.
- The Iron Core series explores aviation infrastructure, highlighting how legacy systems like teletype-era codes and fare rules persist due to industry-wide agreements and specific use cases.