UA 3377 then AA 1861 at O'Hare
Pittsburgh → Chicago → San Diego
Timetable, Chicago time
08:30UA 3377 from Pittsburgh at the gate
21:20AA 1861 to San Diego leaves the gate
12 h 50 apart on the timetable
AA 1861 leaves 12 h 50 after UA 3377 arrives on the timetable: more than half a day, so not a connection we count.