F9 4567 then UA 2201 at Denver
St Louis → Denver → Jackson
Timetable, Denver time
21:30F9 4567 from St Louis at the gate
19:19UA 2201 to Jackson leaves the gate
21 h 49 apart on the timetable, overnight
UA 2201 leaves 21 h 49 after F9 4567 arrives on the timetable: more than half a day, so not a connection we count.