RBD (Reservation Booking Designator) / booking class
A single-letter code an airline uses to manage seat inventory within a cabin. One cabin is split into many booking classes — for example several economy classes at different price levels — and each class is opened or closed as the flight sells. Availability is shown per class, not just per cabin.
Also called: booking class, booking code, sub-class.
Why it matters
Because each fare is tied to a booking class, a fare can only be sold while its class has seats left. This is why the same flight can show a cheaper fare one hour and only a more expensive one the next: the lower class has closed.
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