UA 6047 then AA 4603 at O'Hare
Pittsburgh → Chicago → Louisville
Timetable, Chicago time
20:31UA 6047 from Pittsburgh at the gate
18:55AA 4603 to Louisville leaves the gate
22 h 24 apart on the timetable, overnight
AA 4603 leaves 22 h 24 after UA 6047 arrives on the timetable: more than half a day, so not a connection we count.