UA 6138 then AA 5335 at Charlotte
Houston → Charlotte → South Bend
Timetable, Charlotte time
15:54UA 6138 from Houston at the gate
15:48AA 5335 to South Bend leaves the gate
23 h 54 apart on the timetable, overnight
AA 5335 leaves 23 h 54 after UA 6138 arrives on the timetable: more than half a day, so not a connection we count.