UA 593 then UA 6086 at Houston
San Antonio → Houston → Shreveport
Timetable, Houston time
10:42UA 593 from San Antonio at the gate
07:00UA 6086 to Shreveport leaves the gate
20 h 18 apart on the timetable, overnight
UA 6086 leaves 20 h 18 after UA 593 arrives on the timetable: more than half a day, so not a connection we count.