AA 5181 then UA 3755 at Houston
Dallas-Fort Worth → Houston → Lubbock
Timetable, Houston time
09:56AA 5181 from Dallas-Fort Worth at the gate
22:10UA 3755 to Lubbock leaves the gate
12 h 14 apart on the timetable
UA 3755 leaves 12 h 14 after AA 5181 arrives on the timetable: more than half a day, so not a connection we count.