UA 6259 then UA 6086 at Houston
Knoxville → Houston → Shreveport
Timetable, Houston time
08:40UA 6259 from Knoxville at the gate
07:00UA 6086 to Shreveport leaves the gate
22 h 20 apart on the timetable, overnight
UA 6086 leaves 22 h 20 after UA 6259 arrives on the timetable: more than half a day, so not a connection we count.