AA 642 then UA 5981 at O'Hare
Dallas-Fort Worth → Chicago → Grand Rapids
Timetable, Chicago time
13:10AA 642 from Dallas-Fort Worth at the gate
10:42UA 5981 to Grand Rapids leaves the gate
21 h 32 apart on the timetable, overnight
UA 5981 leaves 21 h 32 after AA 642 arrives on the timetable: more than half a day, so not a connection we count.