Originally Posted by
Time traveller
If the BA TATL portion is booked in T, the AA DFW-LAS should book in B fare code. If the WT+ segment booked in W, it may book into Y.
If booked as an AA prime flight, the AA RBD is H for BA T-fares, and Y for BA W-fares; the B above mentioned applies only to BA*/AA codeshares.