If this helps:
Discount Economy: K,L,Q,V,W,U,T,X,N,O,S
Full Fare Economy: Y,B,M,H
Premium Economy: W,E
Discounted Business: D,I,Z
Full Fare Business: J,C,D
First: A,F
Virgin Atlantic
Upper Class
J - Full Fare - companion seat
D - Discounted
I - Discounted
Z - Discounted & Miles + Money
G -...