AA 5253 then UA 3755 at Houston
Washington National → Houston → Lubbock
Timetable, Houston time
10:05AA 5253 from Washington National at the gate
22:10UA 3755 to Lubbock leaves the gate
12 h 05 apart on the timetable
UA 3755 leaves 12 h 05 after AA 5253 arrives on the timetable: more than half a day, so not a connection we count.