DL 2407 then UA 571 at Atlanta
Louisville → Atlanta → San Francisco
Timetable, Atlanta time
07:31DL 2407 from Louisville at the gate
07:00UA 571 to San Francisco leaves the gate
23 h 29 apart on the timetable, overnight
UA 571 leaves 23 h 29 after DL 2407 arrives on the timetable: more than half a day, so not a connection we count.