A.k.a Record_Locator. Unlike eTicket, PNR is not numerical but is often mis-named as a xxx_number.

On the same booking record, two passengers have two unique eTicket numbers, but share a single PNR.

— generated by each airline (or a GDS)

If your flights involve different airlines, there are sometimes separate PNRs for each carrier.

Two airlines can generate the same PNR of 123ABC with no risk of confusion, but this is statistically rare.

PNR is generated by the airline’s computer system, not by the travel agent, but in Feb 2025, JetAbout generated a reservation_code before airline generated a PNR.

In each carrier’s systerm, PNRs should not be recycled within 24 months.