UA 4301 then DL 1777 at Houston
Lubbock → Houston → New York LaGuardia
Timetable, Houston time
18:41UA 4301 from Lubbock at the gate
14:00DL 1777 to New York LaGuardia leaves the gate
19 h 19 apart on the timetable, overnight
DL 1777 leaves 19 h 19 after UA 4301 arrives on the timetable: more than half a day, so not a connection we count.