Simikins
Nerfed
This is the wrong place to be discussing this. Lets move to the social or somethingAlthough falling U-air -> D-tilt definitely isn't true (that's why I said it's probably not true in my original post), it's worth noting that in that specific circumstance, my opponent was facing away from me. This means characters with fast jabs can't use those on me. That means they have to resort to a defensive option to avoid the combo. You might be able to squeeze a turnaround f tilt, grab, or dash attack in afterwards if you think they will use one against you. The main reason I think it may be warranted for testing is to see what defensive options they might employ (although my original post didn't note this. Probably should have said that there). Otherwise, most players I've used falling up air against don't know what defensive options to use really.
To avoid a double post...
I've finished testing Fair > Stationary BF and the thread is here: http://smashboards.com/threads/fair-bouncing-fish-combo.427967/
Fair > Jump BF and Fair > Dash Jump BF are still being tested.