UA 3919 then DL 1778 at Houston
Raleigh-Durham → Houston → New York LaGuardia
Timetable, Houston time
23:15UA 3919 from Raleigh-Durham at the gate
18:45DL 1778 to New York LaGuardia leaves the gate
19 h 30 apart on the timetable, overnight
DL 1778 leaves 19 h 30 after UA 3919 arrives on the timetable: more than half a day, so not a connection we count.