AA 725 then UA 3910 at O'Hare
Los Angeles → Chicago → Newark
Timetable, Chicago time
16:05AA 725 from Los Angeles at the gate
07:30UA 3910 to Newark leaves the gate
15 h 25 apart on the timetable, overnight
UA 3910 leaves 15 h 25 after AA 725 arrives on the timetable: more than half a day, so not a connection we count.