DL 5603 then B6 1303 at Boston
Madison → Boston → Phoenix
Timetable, Boston time
18:52DL 5603 from Madison at the gate
18:45B6 1303 to Phoenix leaves the gate
23 h 53 apart on the timetable, overnight
B6 1303 leaves 23 h 53 after DL 5603 arrives on the timetable: more than half a day, so not a connection we count.