DL 2109 then UA 3914 at Houston
New York LaGuardia → Houston → Dallas-Fort Worth
Timetable, Houston time
19:32DL 2109 from New York LaGuardia at the gate
08:00UA 3914 to Dallas-Fort Worth leaves the gate
12 h 28 apart on the timetable, overnight
UA 3914 leaves 12 h 28 after DL 2109 arrives on the timetable: more than half a day, so not a connection we count.