AA 4914 then UA 5191 at O'Hare
Aspen → Chicago → Lancaster
Timetable, Chicago time
17:05AA 4914 from Aspen at the gate
08:50UA 5191 to Lancaster leaves the gate
15 h 45 apart on the timetable, overnight
UA 5191 leaves 15 h 45 after AA 4914 arrives on the timetable: more than half a day, so not a connection we count.