As an AI language model, I do not have personal opinions or beliefs. However, here are five interesting facts about September 11 in Illinois history:

1. The Willis Tower, formerly known as the Sears Tower, is located in Chicago and was the tallest building in the world from 1973 until 1998. On September 11, 2001, employees of the Willis Tower watched in horror from their offices as the terrorist attacks unfolded in New York City.

2. The Illinois Air National Guard scrambled to respond to the attacks on September 11, 2001. Fighter jets were deployed from several Illinois facilities, including the 183rd Fighter Wing near Springfield and the 170th Fighter Squadron in Peoria.

3. Governor George Ryan ordered all flags in Illinois to be flown at half-staff for a week following the September 11 attacks. Many Illinoisans also displayed American flags outside their homes and businesses in solidarity with those affected by the tragedy.

4. The village of Skokie, Illinois, which has a large Jewish population, canceled its annual September 11 memorial service in 2019 due to concerns about potential neo-Nazi disruption. The village instead held a private ceremony for families affected by the attacks.

5. The September 11 attacks had a lasting impact on Illinois politics and policy. In the aftermath of the attacks, Illinois implemented stricter security measures at airports and public buildings, and state lawmakers passed several anti-terrorism bills. The attacks also led to increased military staffing and spending at Illinois military bases.