UA 4301 then UA 3871 at Houston
Lubbock → Houston → EFD
Timetable, Houston time
18:41UA 4301 from Lubbock at the gate
13:00UA 3871 to EFD leaves the gate
18 h 19 apart on the timetable, overnight
UA 3871 leaves 18 h 19 after UA 4301 arrives on the timetable: more than half a day, so not a connection we count.