AA 1531 then DL 1697 at Phoenix
Chicago O'Hare → Phoenix → Boston
Timetable, Phoenix time
20:07AA 1531 from Chicago O'Hare at the gate
14:20DL 1697 to Boston leaves the gate
18 h 13 apart on the timetable, overnight
DL 1697 leaves 18 h 13 after AA 1531 arrives on the timetable: more than half a day, so not a connection we count.