UA 4863 then DL 2709 at Houston
Lubbock → Houston → Atlanta
Timetable, Houston time
08:36UA 4863 from Lubbock at the gate
08:05DL 2709 to Atlanta leaves the gate
23 h 29 apart on the timetable, overnight
DL 2709 leaves 23 h 29 after UA 4863 arrives on the timetable: more than half a day, so not a connection we count.