UA 3010 then UA 4603 at Houston
Buenos Aires → Houston → Huntsville
Timetable, Houston time
08:05UA 3010 from Buenos Aires at the gate
08:00UA 4603 to Huntsville leaves the gate
23 h 55 apart on the timetable, overnight
UA 4603 leaves 23 h 55 after UA 3010 arrives on the timetable: more than half a day, so not a connection we count.