What is a fare class?

A fare class (or booking class / RBD — reservation booking designator) is the single letter on your ticket that identifies the exact fare bucket you bought within a cabin. Two people in the same economy cabin can be in very different fare classes, which changes refundability, change fees, mileage earning, and upgrade eligibility.

Why do fare classes matter?

Your fare class — not just your cabin — determines how many frequent-flyer miles you earn, whether the ticket is refundable or changeable, and whether it can be upgraded. A cheap economy fare class often earns fewer miles and can't be changed.

Do fare class letters mean the same thing on every airline?

The broad conventions are shared (F/A = first, J/C/D/I/Z = business, Y/B/M = full-fare economy, and letters like K/L/Q/N/V = discount economy), but each airline assigns its own exact rules to each letter. Use this as a reliable guide, then confirm the specifics in your fare rules.

Fare Class Decoder

Every airline ticket carries a single-letter fare class (or booking class / RBD) that quietly controls your refundability, miles earning, and upgrade eligibility. Type the letter from your ticket to decode what you actually bought.

Enter your fare class letter

Every fare class, decoded

Code	Cabin	What it usually means	Refundable
F	First	Full-fare first class — the most flexible first-class ticket.	Usually
A	First	Discounted first class.	Sometimes
P	First	Discounted first class (some carriers use P for premium buckets).	Sometimes
J	Business	Full-fare business class — the most flexible business ticket.	Usually
C	Business	Full business class.	Usually
D	Business	Discounted business class.	Sometimes
I	Business	Discounted business class (often used for upgrades and awards).	Sometimes
Z	Business	Discounted business class.	Sometimes
W	Premium Economy	Premium economy (full fare on many carriers).	Sometimes
E	Economy	Varies widely — often basic economy or a discount bucket; premium economy on a few carriers.	Rarely
Y	Economy	Full-fare economy — the most flexible economy ticket.	Usually
B	Economy	Flexible economy.	Sometimes
M	Economy	Standard economy.	Sometimes
H	Economy	Discount economy.	Rarely
K	Economy	Discount economy.	Rarely
Q	Economy	Discount economy.	Rarely
L	Economy	Deep-discount economy.	Rarely
N	Economy	Deep-discount economy (basic economy on some carriers).	Rarely
O	Economy	Deep-discount economy.	Rarely
S	Economy	Standard-to-discount economy.	Rarely
T	Economy	Discount economy.	Rarely
U	Economy	Discount economy (shuttle/standby on some carriers).	Rarely
V	Economy	Discount economy.	Rarely
G	Economy	Discount or group economy.	Rarely
X	Economy	Deep-discount or award economy.	Rarely
R	First	Discounted premium cabin on many carriers (historically supersonic); varies.	Sometimes

Cabins shown: First, Business, Premium Economy, Economy. Conventions are industry-standard; exact rules vary by airline.

Why the letter matters more than the cabin

Two travelers sitting side by side in economy can hold completely different tickets. One bought a Y fare — fully flexible, full miles, upgrade-eligible. The other bought an N fare — non-refundable, minimal miles, no upgrades. Same seat, very different rights. The fare class is how airlines price and control those differences, and it's printed right on your itinerary.

When you compare flights on Planet, we show the effective member cost after cashback so you're comparing the real value of a fare — not just a headline price that hides a restrictive fare class.

Frequently asked questions

What is a fare class?: A fare class (or booking class / RBD — reservation booking designator) is the single letter on your ticket that identifies the exact fare bucket you bought within a cabin. Two people in the same economy cabin can be in very different fare classes, which changes refundability, change fees, mileage earning, and upgrade eligibility.
Why do fare classes matter?: Your fare class — not just your cabin — determines how many frequent-flyer miles you earn, whether the ticket is refundable or changeable, and whether it can be upgraded. A cheap economy fare class often earns fewer miles and can't be changed.
Do fare class letters mean the same thing on every airline?: The broad conventions are shared (F/A = first, J/C/D/I/Z = business, Y/B/M = full-fare economy, and letters like K/L/Q/N/V = discount economy), but each airline assigns its own exact rules to each letter. Use this as a reliable guide, then confirm the specifics in your fare rules.