UA 3878 then DL 2140 at Houston
IAB → Houston → New York LaGuardia
Timetable, Houston time
22:40UA 3878 from IAB at the gate
11:09DL 2140 to New York LaGuardia leaves the gate
12 h 29 apart on the timetable, overnight
DL 2140 leaves 12 h 29 after UA 3878 arrives on the timetable: more than half a day, so not a connection we count.