I was trying to buy tickets of Air Europa (its program is Flying Blue), but there seems to be no way to find the booking class of the flights you're buying...

Well, according to the web site of Flying Blue, booking classes of B, C, D, H, I, J, K, L, M, N, O, R, S, T, U, V, W, X, Y of Air Europa are eligible for mile accumulation. So, what if my booking class is none of the classes listed? Anyone knows how can I find the booking class before purchase? Thank you!