DL 3122 then DL 903 at Atlanta
Pittsburgh → Atlanta → Seattle
Timetable, Atlanta time
22:00DL 3122 from Pittsburgh at the gate
21:20DL 903 to Seattle leaves the gate
23 h 20 apart on the timetable, overnight
DL 903 leaves 23 h 20 after DL 3122 arrives on the timetable: more than half a day, so not a connection we count.