UA 1564 then AA 1355 at DFW
Washington → Dallas-Fort Worth → Oklahoma City
Timetable, Dallas-Fort Worth time
15:14UA 1564 from Washington at the gate
13:11AA 1355 to Oklahoma City leaves the gate
21 h 57 apart on the timetable, overnight
AA 1355 leaves 21 h 57 after UA 1564 arrives on the timetable: more than half a day, so not a connection we count.