DL 431 then DL 937 at Atlanta
Denver → Atlanta → Tucson
Timetable, Atlanta time
11:58DL 431 from Denver at the gate
11:47DL 937 to Tucson leaves the gate
23 h 49 apart on the timetable, overnight
DL 937 leaves 23 h 49 after DL 431 arrives on the timetable: more than half a day, so not a connection we count.