UA 556 then UA 6086 at Houston
Nashville → Houston → Shreveport
Timetable, Houston time
08:45UA 556 from Nashville at the gate
07:00UA 6086 to Shreveport leaves the gate
22 h 15 apart on the timetable, overnight
UA 6086 leaves 22 h 15 after UA 556 arrives on the timetable: more than half a day, so not a connection we count.