3S 448 then UA 4772 at O'Hare
Toronto Pearson → Chicago → Columbia Regional
Timetable, Chicago time
14:063S 448 from Toronto Pearson at the gate
12:45UA 4772 to Columbia Regional leaves the gate
22 h 39 apart on the timetable, overnight
UA 4772 leaves 22 h 39 after 3S 448 arrives on the timetable: more than half a day, so not a connection we count.