WN 4144 then WN 554 at Denver
St Louis → Denver → Phoenix Sky Harbor
Timetable, Denver time
19:55WN 4144 from St Louis at the gate
19:40WN 554 to Phoenix Sky Harbor leaves the gate
23 h 45 apart on the timetable, overnight
WN 554 leaves 23 h 45 after WN 4144 arrives on the timetable: more than half a day, so not a connection we count.