DL 5641 then UA 723 at Boston
Cleveland → Boston → Houston
Timetable, Boston time
19:35DL 5641 from Cleveland at the gate
17:17UA 723 to Houston leaves the gate
21 h 42 apart on the timetable, overnight
UA 723 leaves 21 h 42 after DL 5641 arrives on the timetable: more than half a day, so not a connection we count.