C, J, D, J and D are all business class.

Y, B, E, M, W, H, Q, N, V, T, S, L and K are economy class.

F, C, Y C and Y are full-price ticket cabins for first class, business class and economy class.

Other letters are the compartments of each cabin, that is, the cabins representing different discount fares.

In the economy class of Singapore Airlines, the mileage can be accumulated before the H cabin mentioned above, but not after the Q cabin.