AA 4226 then UA 3910 at O'Hare
Dayton → Chicago → Newark
Timetable, Chicago time
11:59AA 4226 from Dayton at the gate
07:30UA 3910 to Newark leaves the gate
19 h 31 apart on the timetable, overnight
UA 3910 leaves 19 h 31 after AA 4226 arrives on the timetable: more than half a day, so not a connection we count.