UA 702 then DL 2398 at Atlanta
San Francisco → Atlanta → Baltimore
Timetable, Atlanta time
18:07UA 702 from San Francisco at the gate
15:16DL 2398 to Baltimore leaves the gate
21 h 09 apart on the timetable, overnight
DL 2398 leaves 21 h 09 after UA 702 arrives on the timetable: more than half a day, so not a connection we count.