For this year, engineering is $19,372 a semester - so likely where the $40K came from - of course there’s always variables to that.
I’m not sure if Illinois has scholarships for low income students or high performers (similar to TN, FL, GA).
Another school to add to the list -and not far - Mizzou. They have an aerospace minor (in theory with Mech E). You are assured $21.5K off $31K tuition - and as a URM you might get $29.5K, thus making tuition just $1,500. So the $90K would last and then som!!! It would even work with the normal scholarship.
This is the flagship. Missouri also has Missouri Science & Tech in Rolla - a fine school but I’m not sure would have a similar financial incentive.
See - lots of ideas for you - in state is great - but opportunities abound!!
See the link below.