UA 3501 then DL 2816 at O'Hare
Kansas City → Chicago → Boston
Timetable, Chicago time
17:05UA 3501 from Kansas City at the gate
15:05DL 2816 to Boston leaves the gate
22 h apart on the timetable, overnight
DL 2816 leaves 22 h after UA 3501 arrives on the timetable: more than half a day, so not a connection we count.