LR 654 then UA 6239 at Dulles
Guatemala City → Washington → Charlotte
Timetable, Washington time
00:42LR 654 from Guatemala City at the gate
12:43UA 6239 to Charlotte leaves the gate
12 h 01 apart on the timetable
UA 6239 leaves 12 h 01 after LR 654 arrives on the timetable: more than half a day, so not a connection we count.