UA 1644 then UA 6086 at Houston
San Juan → Houston → Shreveport
Timetable, Houston time
10:46UA 1644 from San Juan at the gate
07:00UA 6086 to Shreveport leaves the gate
20 h 14 apart on the timetable, overnight
UA 6086 leaves 20 h 14 after UA 1644 arrives on the timetable: more than half a day, so not a connection we count.