UA 1676 then UA 3754 at Houston
Medellín → Houston → Waco
Timetable, Houston time
14:39UA 1676 from Medellín at the gate
11:30UA 3754 to Waco leaves the gate
20 h 51 apart on the timetable, overnight
UA 3754 leaves 20 h 51 after UA 1676 arrives on the timetable: more than half a day, so not a connection we count.