A Flight Number (e.g., AA123 or LH456) identifies the specific scheduled route and time of a flight operated by an airline; it is public and shared by everyone on that plane. In contrast, a PNR (Passenger Name Record), also known as a Booking Reference or Record Locator, is a unique 6-character alphanumeric code (e.g., R3K7W9) private to your specific reservation. While the flight number tells you where the plane is going, the PNR acts as the digital file containing your personal details, ticket status, meal preferences, and seat selection. In 2026, you use the PNR to check in online or manage your booking, while the flight number is what you'll look for on airport departure screens to find your gate and boarding time.