AA 1178 then AA 4612 at Miami
Washington National → Miami → Oklahoma City
Timetable, Miami time
08:46AA 1178 from Washington National at the gate
20:59AA 4612 to Oklahoma City leaves the gate
12 h 13 apart on the timetable
AA 4612 leaves 12 h 13 after AA 1178 arrives on the timetable: more than half a day, so not a connection we count.