F9 1596 then DL 406 at Atlanta
Chicago O'Hare → Atlanta → Bozeman
Timetable, Atlanta time
13:32F9 1596 from Chicago O'Hare at the gate
11:06DL 406 to Bozeman leaves the gate
21 h 34 apart on the timetable, overnight
DL 406 leaves 21 h 34 after F9 1596 arrives on the timetable: more than half a day, so not a connection we count.