AA 1951 then DL 514 at Boston
Chicago O'Hare → Boston → Phoenix
Timetable, Boston time
09:29AA 1951 from Chicago O'Hare at the gate
08:35DL 514 to Phoenix leaves the gate
23 h 06 apart on the timetable, overnight
DL 514 leaves 23 h 06 after AA 1951 arrives on the timetable: more than half a day, so not a connection we count.