UA 4301 then UA 678 at Houston
Lubbock → Houston → New York LaGuardia
Timetable, Houston time
18:41UA 4301 from Lubbock at the gate
10:00UA 678 to New York LaGuardia leaves the gate
15 h 19 apart on the timetable, overnight
UA 678 leaves 15 h 19 after UA 4301 arrives on the timetable: more than half a day, so not a connection we count.