Originally Posted by
anabolism
My understanding is that the rule is specifically to accommodate overnight connections "close to" the first flight out (the rule is 6 AM rather than first flight). I've never seen any restriction that the next-day flight be the international one. I'd be quite surprised if the poster has any question or problem with access.
OP's only problem is that they will have exactly one hour from when FFD officially opens until the scheduled departure of the flight. So make sure to let them know as soon as you get in that your flight boards in 30 min!