I don’t think (someone can correct me if I’m wrong) but ASU doesn’t offer a dual or double degree program with ME/AE.
Most of your classes the first year, will be shared between ME and AE (physics, calculus, etc.). You’ll have time to decide if you want to switch. Once on campus, you will meet your professors, other students and recruiters and that should help you with your choice.
You may also want to think about the accelerated degree program, where you can earn your BS and Masters in 5 years. That’s a much better way to spend your time, money and effort vs a dual degree.
I would also recommend you join a design team, as that may help you determine if you want to do ME or AE. Design teams have different types of engineers working on the same project. You’ll get to do a little “ME” as well as seeing what’s possible with an AE degree.
Good Luck!!