DL 1697 then UA 1349 at Boston
Phoenix → Boston → Chicago O'Hare
Timetable, Boston time
21:00DL 1697 from Phoenix at the gate
09:12UA 1349 to Chicago O'Hare leaves the gate
12 h 12 apart on the timetable, overnight
UA 1349 leaves 12 h 12 after DL 1697 arrives on the timetable: more than half a day, so not a connection we count.