Pretty safe to assume these aircraft will be primarily used to fly TransPacs. I don't think the 788 will be flying TransPacs long term as their size is better suited for replacing 767s on TATLs. Move to 788 was prompted more by performance as the high CASM 777s just aren't cutting it. The 789 will have even better economic performance on these routes and should make AA's Pacific flights break even for once.