WN 4188 then DL 1697 at Phoenix
St Louis → Phoenix → Boston
Timetable, Phoenix time
21:40WN 4188 from St Louis at the gate
14:20DL 1697 to Boston leaves the gate
16 h 40 apart on the timetable, overnight
DL 1697 leaves 16 h 40 after WN 4188 arrives on the timetable: more than half a day, so not a connection we count.