AA 4094 then UA 4177 at O'Hare
Cincinnati Northern Kentucky → Chicago → Buffalo
Timetable, Chicago time
06:59AA 4094 from Cincinnati Northern Kentucky at the gate
06:50UA 4177 to Buffalo leaves the gate
23 h 51 apart on the timetable, overnight
UA 4177 leaves 23 h 51 after AA 4094 arrives on the timetable: more than half a day, so not a connection we count.