AA 3918 then UA 3910 at O'Hare
Greenville-Spartanburg → Chicago → Newark
Timetable, Chicago time
13:00AA 3918 from Greenville-Spartanburg at the gate
07:30UA 3910 to Newark leaves the gate
18 h 30 apart on the timetable, overnight
UA 3910 leaves 18 h 30 after AA 3918 arrives on the timetable: more than half a day, so not a connection we count.