AA 9950 then AA 3811 at O'Hare
Philadelphia → Chicago → Omaha
Timetable, Chicago time
13:49AA 9950 from Philadelphia at the gate
13:47AA 3811 to Omaha leaves the gate
23 h 58 apart on the timetable, overnight
AA 3811 leaves 23 h 58 after AA 9950 arrives on the timetable: more than half a day, so not a connection we count.