UA 4300 then DL 2709 at Houston
Lubbock → Houston → Atlanta
Timetable, Houston time
13:41UA 4300 from Lubbock at the gate
08:05DL 2709 to Atlanta leaves the gate
18 h 24 apart on the timetable, overnight
DL 2709 leaves 18 h 24 after UA 4300 arrives on the timetable: more than half a day, so not a connection we count.