UA 3988 then AA 5211 at Charlotte
Houston → Charlotte → Myrtle Beach
Timetable, Charlotte time
10:49UA 3988 from Houston at the gate
08:40AA 5211 to Myrtle Beach leaves the gate
21 h 51 apart on the timetable, overnight
AA 5211 leaves 21 h 51 after UA 3988 arrives on the timetable: more than half a day, so not a connection we count.