Now I see Spanair somehow hates UA. Here is its deal with UA:
*2.5 : A, F, P
*2.0 : C, D, J, Z
*1.5 : Y
*1.0 : B, E, H, K, L, M, Q, R, S, U, V, W

And here is with Asiana (which I fly the most) :
*2.5 : A, F, P
*2.0 : C, D, J
*1.5 : E, U, Y
*1.0 : B, H, K, M, Q, S
*0.7 : V, W

I've never seen any Asiana tickets other than C and Y personally. Anything below Y is really hard to get here. It seems it's quite a different story in such a huge country like the US. Your mileage may really vary here :-)

I usually fly 30k miles/year. Mostly within Asia or to Europe. So I think Spanair Plus is the ideal FFP for people like me. Or if you know a program that would be better suited for me, please let me know.

Thank you