UA 638 then AV 2352 at San Francisco
Chicago O'Hare → San Francisco → Burbank
Timetable, San Francisco time
15:35UA 638 from Chicago O'Hare at the gatealso AC 4116
08:40AV 2352 to Burbank leaves the gate
17 h 05 apart on the timetable, overnight
AV 2352 leaves 17 h 05 after UA 638 arrives on the timetable: more than half a day, so not a connection we count.