Fare Basis Code

What Is a Fare Basis Code?

A fare basis code is a short alphanumeric string — typically three to eight characters — that links a ticket to a specific, filed fare product. It appears on the ticket and in the passenger name record (PNR), and it is what airline staff, global distribution systems (GDSs), and revenue accounting systems use to identify exactly which price was paid and which conditions apply.

Structure

Relationship to Booking Class (RBD)

The fare basis code is broader than the booking class alone. The RBD is only the letter that determines seat inventory and pricing tier; the fare basis code incorporates that letter and adds the full set of fare rules an airline has filed for that specific product — validity dates, refund and change conditions, and routing restrictions among them. Two tickets booked in the same RBD can still carry different fare basis codes if they were sold under different fare rules or promotions.

Why It Matters

Fare basis codes are central to how airlines file, distribute, and enforce pricing. They are typically filed through fare-distribution systems such as ATPCO, then distributed to travel agencies and online booking channels through GDSs. When a ticket needs to be reissued, refunded, or audited, the fare basis code is the reference point used to determine which rules govern the change.