Hi everyone! I've never flown before and I'm flying alone, so please bear with me. I'm flying out of PIT into SAT and a 4 hour layover at O'Hare. Since I don't have the privilege of traveling nearly as much as I would like, or at all really, I would love to check out downtown Chicago even if it's only for an hour. My question is, will I have time to make it to the city and walk around for an hour or so if my layover is only 3hrs 40mins? I really appreciate any help! Thank you!