UA 641 then UA 6234 at Dulles
Atlanta (ATL) → Washington → Charlotte
Timetable, Washington time
07:18UA 641 from Atlanta (ATL) at the gate
22:20UA 6234 to Charlotte leaves the gate
15 h 02 apart on the timetable
UA 6234 leaves 15 h 02 after UA 641 arrives on the timetable: more than half a day, so not a connection we count.