AA 3598 then UA 3755 at Houston
Dallas-Fort Worth → Houston → Lubbock
Timetable, Houston time
08:32AA 3598 from Dallas-Fort Worth at the gate
22:10UA 3755 to Lubbock leaves the gate
13 h 38 apart on the timetable
UA 3755 leaves 13 h 38 after AA 3598 arrives on the timetable: more than half a day, so not a connection we count.