AA 1938 then UA 5201 at O'Hare
Dallas-Fort Worth → Chicago → Milwaukee
Timetable, Chicago time
07:35AA 1938 from Dallas-Fort Worth at the gate
20:00UA 5201 to Milwaukee leaves the gate
12 h 25 apart on the timetable
UA 5201 leaves 12 h 25 after AA 1938 arrives on the timetable: more than half a day, so not a connection we count.