UA 3501 then AA 4189 at O'Hare
Kansas City → Chicago → Missoula
Timetable, Chicago time
17:05UA 3501 from Kansas City at the gate
09:40AA 4189 to Missoula leaves the gate
16 h 35 apart on the timetable, overnight
AA 4189 leaves 16 h 35 after UA 3501 arrives on the timetable: more than half a day, so not a connection we count.