Deciphering the code
The letters airlines assign to certain levels of coach can  vary widely, but a couple are universal. "Y" class is a widespread  denotation for the highest class in coach among most major airlines,  according to Jami Counter, senior director of TripAdvisor Flights and a  former pricing strategist at American Airlines. These tickets are  usually fully refundable, last-minute coach fares purchased mainly by  business travelers. They're the most expensive tickets, but they have  the most flexibility.
Some others that are generally used among the airlines: "J" or "C"  usually indicate business class. "F" and "P" denote first class or  premium.  Full article from MSNBC











