F9 1428 then DL 5714 at Philadelphia
Nashville → Philadelphia → Boston
Timetable, Philadelphia time
20:20F9 1428 from Nashville at the gate
19:55DL 5714 to Boston leaves the gate
23 h 35 apart on the timetable, overnight
DL 5714 leaves 23 h 35 after F9 1428 arrives on the timetable: more than half a day, so not a connection we count.