There are cases where such behaviour of mixed classes could be of benefit - rather than showing no availabilty where , for example, SFO-LAX was unavailable in buisness whilst LAX-AKL was available , it can now show a mixed offering of economy followed by business
It would seem to be a fairly complex change to start determining which flight mappings should be offered and which shoudl not
If there was an option of direct flights only , that would seem to be the best if AA could offer it