DL 1697 then UA 503 at Boston
Phoenix → Boston → Chicago O'Hare
Timetable, Boston time
21:00DL 1697 from Phoenix at the gate
10:25UA 503 to Chicago O'Hare leaves the gate
13 h 25 apart on the timetable, overnight
UA 503 leaves 13 h 25 after DL 1697 arrives on the timetable: more than half a day, so not a connection we count.