The AAC isn't locked into a bowl like the other conferences. There are two possibilities: 1) Florida State gets to the championship, and the Orange bowl picks Notre Dame with the second pick and the AAC champion with the third pick (0% chance of that happening), or 2) Alabama makes the championship, and the Sugar Bowl takes Notre Dame #1 (dissing the SEC), and then takes the AAC champion because the don't want to take a required Fresno State/North Illinois (1% chance of that happening).
This is how it works...
Rose: Pac-12 vs Big Ten
Orange: ACC vs at-large
Sugar: SEC vs at-large
Fiesta: Big 12 vs at-large
The Sugar, Orange, and Fiesta bowls rotate picking orders when picking between the AAC champion and two at-larges. The AAC champion is normally a lesser draw than at least one of the two at-larges.
The picking order this year is Orange, Sugar, Fiesta.
So assuming it's Oregon vs Alabama, the picking order would be Sugar, Rose, Orange, Sugar, Fiesta. In this scenario, there is a 99% chance that Notre Dame is facing either Ohio State or Florida State. Rough sleddin' there.
If Florida State makes it, the order is: Sugar, Orange, Orange, Sugar, Fiesta. In which case I would bet it's Clemson vs Notre Dame in the Orange Bowl.