AA 4337 then UA 3872 at O'Hare
Indianapolis → Chicago → LCQ
Timetable, Chicago time
11:53AA 4337 from Indianapolis at the gate
00:31UA 3872 to LCQ leaves the gate
12 h 38 apart on the timetable, overnight
UA 3872 leaves 12 h 38 after AA 4337 arrives on the timetable: more than half a day, so not a connection we count.