UA 804 then AA 2414 at Dulles
Tokyo → Washington → Dallas-Fort Worth
Timetable, Washington time
15:40UA 804 from Tokyo at the gate
14:42AA 2414 to Dallas-Fort Worth leaves the gate
23 h 02 apart on the timetable, overnight
AA 2414 leaves 23 h 02 after UA 804 arrives on the timetable: more than half a day, so not a connection we count.