Which acronym represents a passenger identifier used in airline systems?

• A. PIN
• B. PSU
• C. QR
• D. SSI

Answer: (A)

A passenger identification number is a unique token used by airline systems to pull up and link a traveler's records across bookings, check-in, seating, and flight segments. In this context, the acronym for that traveler-specific identifier is PIN, standing for Passenger Identification Number. This internal code helps agents quickly access the correct profile and ensure the right passenger is associated with the right bookings and flight data, smoothing verification and processing at various touchpoints. It’s distinct from a boarding pass code; while a boarding pass may display a QR code to convey data, the QR itself is a code the system scans, not the stand-alone identifier used to locate a passenger’s record. The other options don’t represent a standard passenger identifier in airline systems: PSU is a hardware term, QR is a data-encoding method used on passes, and SSI isn’t used as a passenger ID in this context.