UA 4019 then UA 1966 at Houston
Little Rock → Houston → Washington National
Timetable, Houston time
08:40UA 4019 from Little Rock at the gate
07:45UA 1966 to Washington National leaves the gate
23 h 05 apart on the timetable, overnight
UA 1966 leaves 23 h 05 after UA 4019 arrives on the timetable: more than half a day, so not a connection we count.