UA 1591 then AV 2352 at San Francisco
San Antonio → San Francisco → Burbank
Timetable, San Francisco time
11:02UA 1591 from San Antonio at the gate
08:40AV 2352 to Burbank leaves the gate
21 h 38 apart on the timetable, overnight
AV 2352 leaves 21 h 38 after UA 1591 arrives on the timetable: more than half a day, so not a connection we count.