UA 3236 then UA 5091 at Houston
Midland → Houston → Chattanooga
Timetable, Houston time
18:30UA 3236 from Midland at the gate
12:55UA 5091 to Chattanooga leaves the gate
18 h 25 apart on the timetable, overnight
UA 5091 leaves 18 h 25 after UA 3236 arrives on the timetable: more than half a day, so not a connection we count.