What is a PNR (passenger name record)?

What does a PNR contain?

A PNR is created when a reservation is made, and it becomes the record the airline works from afterwards — the thing an agent opens when a traveller calls about a delay, a seating request or a spelling correction. Four things sit at its centre: the itinerary, the travellers, the service requests attached to the booking, and the ticket numbers issued against it.

Traveller details are recorded person by person rather than locator by locator, which is why a group of people can share one record. Service requests such as a special meal, a wheelchair or an infant in a lap are stored against the booking and travel with it through the itinerary; the request codes behind them are explained under SSR codes. Where a flight is sold by one airline and flown by another, the itinerary has to show both sides of that arrangement — see marketing carrier.

Ticket numbers are added when the booking is ticketed, and the record can exist before that step happens. The ticket number is what identifies the document that carries the traveller, which is a separate article: e-ticket number.

The name on a booking is not always the name on the loyalty account. United Airlines' MileagePlus rules allow an award to be issued in the member's own name or in the name and for the use of another person, provided the use is non-commercial, and only after the member validates the account with a password or another security measure the programme has in place at the time of the request. [6]

How is a PNR different from a ticket number or a frequent-flyer number?

The record locator is the handle for the booking itself. It is issued per booking, not per passenger: four people on one reservation normally share one locator, while a traveller who books three separate trips usually ends up with three. The locator says nothing about whether the booking has been paid for.

The ticket number identifies the document issued against the booking, so one record can carry several. A traveller who can quote a locator but has no ticket number has a reservation, not a ticket.

The frequent-flyer account number belongs to the loyalty account, not to the booking. It is stored on the reservation so the airline can credit the flight and apply status benefits, which is why it has to stay there: United's rules require a member receiving benefits at booking, check-in or travel to maintain their MileagePlus account number throughout the entire reservation and any subsequent reservations created from the original reservation, and for the entire duration of the travel associated with them. [6] Where United permits mileage from flights on other airlines to be credited to a MileagePlus account, that mileage may be credited in only one frequent flyer or loyalty programme unless otherwise expressly provided. [6]

Knowing a locator is not the same as holding the account. United says that only the member named on the account is entitled to access account information, and that credentials must not be shared or given to anyone else. [6]

Why can one trip have more than one PNR?

A record belongs to whoever holds it. When a journey involves more than one carrier or more than one agency, each party can keep its own record of the part it controls, so the same journey can generate several locators. In practice that means keeping every locator the trip produces, rather than assuming the first one covers the whole route.

Records also multiply when a booking changes. United's rules refer to "any subsequent reservations created from the original reservation", and provide that if a companion obtains benefits because of a member's status but the member is no longer travelling on the original reservation, the companion travelling on that reservation stops being eligible for the benefits that came from the member's status. [6]

Who else sees the same record?

Border agencies handle traveller data on their own terms. U.S. Customs and Border Protection, which screens both foreign visitors and returning U.S. citizens, lists the Advance Passenger Information System (APIS) among the resources linked from its travel pages, alongside its Trusted Traveler Programs, and describes advanced biometric facial comparison technology at ports of entry. [1]

The airline side runs through industry standards. IATA groups its passenger work under headings including Passenger Facilitation, described as "enabling a seamless, secure passenger journey", and One ID, described as "advanced sharing of information, contactless", together with a separate Data Protection & Privacy workstream. [2] Its Common Use Standards work is described as optimising passenger processes using shared technologies. [2]

Exceptions and limits

• A locator is not a ticket and not a receipt. It opens the booking; the ticket number identifies the document issued against it, and payment sits outside the record itself.
• Credit is not automatic. United puts the responsibility on the member to make sure mileage and qualifying credits are properly credited, and requires claims for mileage credit to reach it within twelve months of the date the mileage was claimed to have been earned, noting that certain partners have different retro-credit periods. [6] The steps are set out under missing miles claim.
• Benefits can follow the person, not the booking. Where a companion receives benefits through a member's status and the member later leaves the original reservation, the companion's eligibility for those benefits ends. [6]
• Access to the loyalty account is separate. United entitles only the member named on the account to access account information, and treats account credentials as non-transferable. [6]
• Scope. The loyalty provisions on this page are United Airlines MileagePlus rules and apply to that programme; booking, ticketing and record-locator practice at other airlines, and border processes in other countries, are outside this entry.

Related pages

Terms: e-ticket number, marketing carrier, SSR codes. Guide: missing miles claim. Index: all frequent flyer terms.

Sources

Sources checked on 18 October 2026. The loyalty rules quoted come from United Airlines MileagePlus and apply to that programme only; the booking, ticketing and border-control practices of other airlines, and of governments other than the United States, are not covered here.

1. U.S. Customs and Border Protection — Travel, checked 18 October 2026
2. IATA — Passenger Experience & Policy, checked 18 October 2026
3. United Airlines MileagePlus program rules, checked 18 October 2026