I've noticed that on several AA flights, the only available inventory booking classes are C, Y, B, M, V, K, and Q. The booking classes for RTW tickets are A, D, and L in the order of highest to lowest class. So if one were to hold an AONEX or DONEX ticket that contains an AA sector with those inventory booking classes, which booking class does it get booked under since A, D, L are not being offered?