AA 490 then UA 3914 at O'Hare
Philadelphia → Chicago → Houston
Timetable, Chicago time
22:30AA 490 from Philadelphia at the gate
20:30UA 3914 to Houston leaves the gate
22 h apart on the timetable, overnight
UA 3914 leaves 22 h after AA 490 arrives on the timetable: more than half a day, so not a connection we count.