AA 642 then UA 5215 at O'Hare
Dallas-Fort Worth → Chicago → Lincoln
Timetable, Chicago time
13:10AA 642 from Dallas-Fort Worth at the gate
09:10UA 5215 to Lincoln leaves the gate
20 h apart on the timetable, overnight
UA 5215 leaves 20 h after AA 642 arrives on the timetable: more than half a day, so not a connection we count.