WN 2728 then DL 514 at Phoenix
St Louis → Phoenix → Boston
Timetable, Phoenix time
08:10WN 2728 from St Louis at the gate
23:23DL 514 to Boston leaves the gate
15 h 13 apart on the timetable
DL 514 leaves 15 h 13 after WN 2728 arrives on the timetable: more than half a day, so not a connection we count.