UA 2806 then DL 472 at Atlanta
Denver → Atlanta → Seattle
Timetable, Atlanta time
14:31UA 2806 from Denver at the gate
14:05DL 472 to Seattle leaves the gate
23 h 34 apart on the timetable, overnight
DL 472 leaves 23 h 34 after UA 2806 arrives on the timetable: more than half a day, so not a connection we count.