UA 4012 then UA 6146 at Houston
Detroit → Houston → Little Rock
Timetable, Houston time
19:07UA 4012 from Detroit at the gate
18:10UA 6146 to Little Rock leaves the gate
23 h 03 apart on the timetable, overnight
UA 6146 leaves 23 h 03 after UA 4012 arrives on the timetable: more than half a day, so not a connection we count.