AA 2097 then UA 3874 at O'Hare
Pittsburgh → Chicago → LCQ
Timetable, Chicago time
06:59AA 2097 from Pittsburgh at the gate
06:30UA 3874 to LCQ leaves the gate
23 h 31 apart on the timetable, overnight
UA 3874 leaves 23 h 31 after AA 2097 arrives on the timetable: more than half a day, so not a connection we count.