UA 3988 then AA 1081 at Charlotte
Houston → Charlotte → Indianapolis
Timetable, Charlotte time
10:49UA 3988 from Houston at the gate
22:55AA 1081 to Indianapolis leaves the gate
12 h 06 apart on the timetable
AA 1081 leaves 12 h 06 after UA 3988 arrives on the timetable: more than half a day, so not a connection we count.