UA 1591 then AA 1845 at San Francisco
San Antonio → San Francisco → Philadelphia
Timetable, San Francisco time
11:02UA 1591 from San Antonio at the gatealso NZ 2372, UA 2490, AC 4201, EK 6003
09:58AA 1845 to Philadelphia leaves the gatealso EI 7276
22 h 56 apart on the timetable, overnight
AA 1845 leaves 22 h 56 after UA 1591 arrives on the timetable: more than half a day, so not a connection we count.