F9 1441 then AA 1366 at O'Hare
Atlanta → Chicago → Denver
Timetable, Chicago time
12:51F9 1441 from Atlanta at the gate
11:54AA 1366 to Denver leaves the gate
23 h 03 apart on the timetable, overnight
AA 1366 leaves 23 h 03 after F9 1441 arrives on the timetable: more than half a day, so not a connection we count.