WN 209 then WN 769 at Denver
St Louis → Denver → Boston
Timetable, Denver time
18:50WN 209 from St Louis at the gate
17:55WN 769 to Boston leaves the gate
23 h 05 apart on the timetable, overnight
WN 769 leaves 23 h 05 after WN 209 arrives on the timetable: more than half a day, so not a connection we count.