DL 2109 then UA 3881 at Houston
New York LaGuardia → Houston → Amarillo
Timetable, Houston time
21:36DL 2109 from New York LaGuardia at the gate
21:30UA 3881 to Amarillo leaves the gate
23 h 54 apart on the timetable, overnight
UA 3881 leaves 23 h 54 after DL 2109 arrives on the timetable: more than half a day, so not a connection we count.