UA 561 then KE 3644 at San Francisco
Kansas City → San Francisco → Atlanta
Timetable, San Francisco time
20:10UA 561 from Kansas City at the gatealso OZ 6318, NZ 9502
11:51KE 3644 to Atlanta leaves the gate
15 h 41 apart on the timetable, overnight
KE 3644 leaves 15 h 41 after UA 561 arrives on the timetable: more than half a day, so not a connection we count.