AA 4344 then UA 3907 at O'Hare
Memphis → Chicago → Cleveland
Timetable, Chicago time
12:41AA 4344 from Memphis at the gate
07:30UA 3907 to Cleveland leaves the gate
18 h 49 apart on the timetable, overnight
UA 3907 leaves 18 h 49 after AA 4344 arrives on the timetable: more than half a day, so not a connection we count.