AA 4521 then DL 2305 at Boston
Rochester → Boston → Dallas-Fort Worth
Timetable, Boston time
06:30AA 4521 from Rochester at the gate
19:30DL 2305 to Dallas-Fort Worth leaves the gate
13 h apart on the timetable
DL 2305 leaves 13 h after AA 4521 arrives on the timetable: more than half a day, so not a connection we count.