AA 642 then UA 5406 at O'Hare
Dallas-Fort Worth → Chicago → Grand Rapids
Timetable, Chicago time
13:10AA 642 from Dallas-Fort Worth at the gate
12:43UA 5406 to Grand Rapids leaves the gate
23 h 33 apart on the timetable, overnight
UA 5406 leaves 23 h 33 after AA 642 arrives on the timetable: more than half a day, so not a connection we count.