UA 4301 then UA 4015 at Houston
Lubbock → Houston → Jacksonville
Timetable, Houston time
18:41UA 4301 from Lubbock at the gate
14:50UA 4015 to Jacksonville leaves the gate
20 h 09 apart on the timetable, overnight
UA 4015 leaves 20 h 09 after UA 4301 arrives on the timetable: more than half a day, so not a connection we count.