] Reporting Code Fare Category Description
] F Unrestricted First Class
] G (new) Restricted First Class
] C Unrestricted Business Class
] D (new) Restricted Business Class
] Y Unrestricted Coach/Economy Class
] X (new) Restricted Coach/Economy Class

Note to me: IATA codes for Ticket class. Also called Fare Identifier Codes (FIC)

BTS - Accounting and Reporting Directives