UA 3010 then UA 1966 at Houston
Buenos Aires → Houston → Washington National
Timetable, Houston time
08:05UA 3010 from Buenos Aires at the gate
07:45UA 1966 to Washington National leaves the gate
23 h 40 apart on the timetable, overnight
UA 1966 leaves 23 h 40 after UA 3010 arrives on the timetable: more than half a day, so not a connection we count.