What code identifies a passenger's itinerary in airline systems?

• A. Seat width
• B. Routing system
• C. Round-trip
• D. Record locator number

Answer: (D)

Airlines use a single, unique handle to pull up every detail of a passenger’s trip. That handle is the record locator number. It’s a short alphanumeric code linked to the passenger’s name record and all flight segments, tickets, seating, and contact information. When you check in or retrieve a booking, you enter this code and the system loads the entire itinerary. The other terms describe different things: seat width is a physical measurement, routing system is how connections are planned, and round-trip denotes the trip type. None of those serve as the universal identifier for an itinerary, which is why the record locator number is the correct answer.