UA 3913 then DL 2099 at Houston
Denver → Houston → New York LaGuardia
Timetable, Houston time
21:22UA 3913 from Denver at the gate
13:30DL 2099 to New York LaGuardia leaves the gate
16 h 08 apart on the timetable, overnight
DL 2099 leaves 16 h 08 after UA 3913 arrives on the timetable: more than half a day, so not a connection we count.