DL 5641 then UA 1015 at Boston
Cleveland → Boston → Chicago O'Hare
Timetable, Boston time
19:35DL 5641 from Cleveland at the gate
18:36UA 1015 to Chicago O'Hare leaves the gate
23 h 01 apart on the timetable, overnight
UA 1015 leaves 23 h 01 after DL 5641 arrives on the timetable: more than half a day, so not a connection we count.