AA 9908 then UA 5215 at O'Hare
Milwaukee → Chicago → Lincoln
Timetable, Chicago time
13:50AA 9908 from Milwaukee at the gate
09:10UA 5215 to Lincoln leaves the gate
19 h 20 apart on the timetable, overnight
UA 5215 leaves 19 h 20 after AA 9908 arrives on the timetable: more than half a day, so not a connection we count.