DL 823 then DL 6939 at San Francisco
Atlanta → San Francisco → Calgary
Timetable, San Francisco time
17:16DL 823 from Atlanta at the gatealso AM 3256, LA 6318
16:40DL 6939 to Calgary leaves the gate
23 h 24 apart on the timetable, overnight
DL 6939 leaves 23 h 24 after DL 823 arrives on the timetable: more than half a day, so not a connection we count.