787 courses
Well given the reduced training requirements for Pilots transitioning from 747 to 787 would make most sense. But as the beech fleet 744 have been refurbished with a projected life long beyond the arrival of the 789, it seems very unlikely that this will happen as Airbus pilots will then have trained on the 747, a more likely scenario is as A346 are returned from lease those pilots will transit to the 787.
Seems logical, but logic and crewing do not make comfortable bed fellows.