My most recent visit was in 2023 so I'm not sure how Wrath of Rakshasa may have affected crowd patterns, but here's what I'd say based on my trips to the park...
First off, if your flight lands at 9 A.M., don't expect to be at the park for opening. Depending on traffic, it's about a 45-75 minute drive from O'Hare to the park, so while not impossible you're unlikely to be there by 10:30 (especially if you need to pick up a rental). However, you should be there within an hour of opening, which will give you a pretty full day of coaster riding.
Secondly, don't expect to hit all sixteen coasters in one day without Fast Lane. All three of my trips to the park have been 1.5 day visits, and that's generally been enough time for one ride on each non-kiddie coaster plus a few non-coaster rides to mix it up. Now, I will say that I've only visited in the June - August period so it is possible early season might be less busy, but here are the typical wait times I've experienced at the park...
45-60 minutes: Superman - Ultimate Flight
30-45 minutes: Dark Knight, Goliath, Maxx Force, Raging Bull, X-Flight
20-30 minutes: Batman The Ride, Flash: Vertical Velocity, Joker, Whizzer
10-20 minutes: American Eagle, Demon, Viper
Given that, as well as your priorities, and assuming an approximately 11 A.M. arrival, here's what I'd recommend to make the most of your day (assuming no Fast Lane...if you buy it, just pick a direction and hit things in order):
1. If it is running, hit Maxx Force immediately, even if the line is an hour. Not only is this perhaps the most unique coaster at the park, but it has been extremely temperamental in my experience, so leaving it until later could potentially mean missing out on what I consider the park's second best coaster. If it is not running, however, I'd recommend skipping it for now and either hitting it when you pass by later or jumping in line right before closing.
2. Head to the back of the park (County Fair), bypassing Whizzer for now (unless the wait is really short...20 minutes or less). Five of the park's coasters are clustered together in this area of the park: American Eagle, Demon, Goliath, Wrath of Rakshasa, and X-Flight. You can take them in whatever order you please, but based on where we're going next Wrath > Demon > Goliath > American Eagle > X-Flight would be the least walking. If you want to ride Sky Striker, now is also the time to do it, but I'd recommend skipping it if the line exceeds 30 minutes.
3. Make your way to the Southwest Territory to ride Raging Bull and Viper (in either order). After these two, I'd recommend finding somewhere to get food, as you should be in the sweet spot between lunch and dinner rushes at this time.
4. Loop around the park to DC Universe for Batman The Ride, Flash: Vertical Velocity, and Joker. Even if you've ridden it at other parks, this is the original Batman and should be considered a priority. Joker, on the other hand, is optional depending on wait time and how late in the day it is currently. If you want to ride either of the junior coasters (Little Dipper and Sprocket Rockets), do that en route to DC Universe.
5. If everything has gone well up until this point, you'll now have three coasters left: Dark Knight, Superman - Ultimate Flight, and Whizzer. If you are doing good on time (2-3 hours before closing), I'd recommend doing the two clones first as they are closer, then hitting Whizzer. If time is getting a bit tight, I'd recommend heading to Whizzer first, then deciding between the clones and possible re-rides. Either way, you can hit Condor in passing.
