AA 2556 then UA 6074 at O'Hare
San Diego → Chicago → Clarksburg
Timetable, Chicago time
19:59AA 2556 from San Diego at the gate
19:50UA 6074 to Clarksburg leaves the gate
23 h 51 apart on the timetable, overnight
UA 6074 leaves 23 h 51 after AA 2556 arrives on the timetable: more than half a day, so not a connection we count.