Regarding the Real ID act, and your ability to use an Illinois Driver's license as a form of ID at the airport:

The answer is Yes. TSA will continue to accept valid driver’s licenses and identification cards issued by all states until January 22, 2018.

The links at the TSA and DHS websites have been reflected to include the most up to date and recent changes.

https://www.tsa.gov/travel/frequently-asked-questions