AA 4914 then UA 4772 at O'Hare
Aspen → Chicago → Columbia Regional
Timetable, Chicago time
17:05AA 4914 from Aspen at the gate
12:45UA 4772 to Columbia Regional leaves the gate
19 h 40 apart on the timetable, overnight
UA 4772 leaves 19 h 40 after AA 4914 arrives on the timetable: more than half a day, so not a connection we count.