DL 1585 then UA 3755 at Houston
Atlanta → Houston → Lubbock
Timetable, Houston time
08:46DL 1585 from Atlanta at the gate
22:10UA 3755 to Lubbock leaves the gate
13 h 24 apart on the timetable
UA 3755 leaves 13 h 24 after DL 1585 arrives on the timetable: more than half a day, so not a connection we count.