AA 3250 then UA 5191 at O'Hare
San Francisco → Chicago → Lancaster
Timetable, Chicago time
13:44AA 3250 from San Francisco at the gate
08:50UA 5191 to Lancaster leaves the gate
19 h 06 apart on the timetable, overnight
UA 5191 leaves 19 h 06 after AA 3250 arrives on the timetable: more than half a day, so not a connection we count.