At low %'s (app. 10%-40%) you will want to DI down diagonally into falcon. This makes it harder for him to keep combo'ing you before he hits the ground. This also gives you a chance to tech on the ground or on a platform that you previously would not be able to if you had not DI'ed. At higher %'s (50% or higher) you want to DI up diagonally away from falcon, so that he cannot jump high enough to hit you again or do an upB finisher. That, my friend is the optimum way to get out of the ******** uair combo. And referring to a previous disscussion, that's also another reason high level falcon players use things like fair and reverse bair to combo instead of just uair, uair, uair, uair, upB ftw. it messes up your DI.
but if you are a falcon player who does uair x 2384928347, upB ftw, I'm sure your ok doing that against most people kuz not a lot of people can DI well enough to get out of it anyway. BUT hopefully with the DI technique I just meantioned, hopefully it will be easier