AA 4996 then UA 3872 at O'Hare
Cedar Rapids → Chicago → LCQ
Timetable, Chicago time
12:30AA 4996 from Cedar Rapids at the gate
00:31UA 3872 to LCQ leaves the gate
12 h 01 apart on the timetable, overnight
UA 3872 leaves 12 h 01 after AA 4996 arrives on the timetable: more than half a day, so not a connection we count.