AA 3918 then UA 5191 at O'Hare
Greenville-Spartanburg → Chicago → Lancaster
Timetable, Chicago time
13:00AA 3918 from Greenville-Spartanburg at the gate
08:50UA 5191 to Lancaster leaves the gate
19 h 50 apart on the timetable, overnight
UA 5191 leaves 19 h 50 after AA 3918 arrives on the timetable: more than half a day, so not a connection we count.