AA 5414 then DL 5714 at Philadelphia
Detroit → Philadelphia → Boston
Timetable, Philadelphia time
07:49AA 5414 from Detroit at the gate
19:55DL 5714 to Boston leaves the gate
12 h 06 apart on the timetable
DL 5714 leaves 12 h 06 after AA 5414 arrives on the timetable: more than half a day, so not a connection we count.