UA 3914 then UA 334 at Houston
Chicago → Houston → New York LaGuardia
Timetable, Houston time
23:27UA 3914 from Chicago at the gate
16:25UA 334 to New York LaGuardia leaves the gate
16 h 58 apart on the timetable, overnight
UA 334 leaves 16 h 58 after UA 3914 arrives on the timetable: more than half a day, so not a connection we count.