Boarding passes contain important information, from whether you may be selected for additional security checks or have to take a later flight due to overbooking.
Most travelers only look at their boarding pass to find out their seat, gate, and the time they need to board the plane. But there are many other important symbols on that ticket that not everyone understands.
PNR
PNR is a 6-digit code consisting of numbers and letters. Turkish Airlines Pegasus explains that PNR stands for Reservation Reference or an airline's internal identifier for a flight. These characters are generated by the airline's computer system, not by the travel agent. Passengers only see these 6 characters when the airline confirms a successful booking request.
It is used by airline staff to access the system, obtain booking information as well as additional requests from customers such as whether special assistance is needed.
SSSS
Passengers may see SSSS printed on their boarding passes if they are traveling within the United States, which stands for “Secondary Security Screening Selected.” This means that the passenger has been selected for additional security screening by the Transportation Security Administration (TSA) and the Department of Homeland Security.
Carry-on luggage will be inspected "extremely thoroughly," according to The Points Guy, a popular website specializing in aviation news in the US. Any items inside the bag may be removed and inspected both inside and out. The lining inside is also carefully inspected. Passengers are also thoroughly checked when going through the security scanner. "Be prepared to be questioned by TSA about whether you packed your own luggage or what your reason for flying is," The Points Guy writes.
This security check is done randomly from the airline passengers.
See Agent
According to American travel magazine Conde Nast Traveler, the phrase "See Agent" appearing on the ticket can imply that the passenger has not been assigned a seat on the flight. The passenger needs to speak to an airport staff to arrange the arrangement. It also means that the passenger is about to fly on a codeshare flight (a flight operated by an airline other than the one that booked the ticket).
The notice also indicates that passengers may need to present documents to immigration officials, such as a tourist visa. If a flight is oversold, the ticket inspector may ask passengers to volunteer to take a later flight.
S/O
If the flight involves a connection or transit, the boarding pass may contain an S/O code. If the transit point is more than a few hours, the S/O may be replaced by an SPTC code.
SEQ
Rhys Jones, a British travel expert, says one of the most interesting codes on a boarding pass is SEQ XXX, which represents the order in which passengers checked in. Many frequent flyers go to great lengths to get the coveted number SEQ 001 (first passenger to check in).
Flight number
The flight number represents the specific flight the passenger will fly, usually appearing as two capital letters and 3-4 numbers. The flight ticket has the symbol VJ453, meaning the passenger will fly on flight number 453 of Vietjet Air.
Airport code
These three-letter codes refer to the passenger's departure and arrival airports. HAN refers to Noi Bai Airport and SNG refers to Tan Son Nhat Airport.
Number of seats
Seat or seat number refers to the passenger's seat, usually expressed by a combination of letters and numbers. If the ticket has the character 12A, it means the passenger is sitting in row 12, seat A.
Barcode
Barcodes, or bar codes, usually appear on the bottom right of the boarding pass. Airline staff will scan this code to check passenger information. This barcode, often called BCBP, is scanned at various points in the airport, including the boarding gate, and is used to speed up the boarding process for passengers.
According to vnexpress.net
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