UA 1388 then AA 1355 at DFW
Houston → Dallas-Fort Worth → Oklahoma City
Timetable, Dallas-Fort Worth time
16:05UA 1388 from Houston at the gate
13:11AA 1355 to Oklahoma City leaves the gate
21 h 06 apart on the timetable, overnight
AA 1355 leaves 21 h 06 after UA 1388 arrives on the timetable: more than half a day, so not a connection we count.