WN 120 then B6 994 at Denver
Kansas City → Denver → Boston
Timetable, Denver time
15:20WN 120 from Kansas City at the gate
14:00B6 994 to Boston leaves the gate
22 h 40 apart on the timetable, overnight
B6 994 leaves 22 h 40 after WN 120 arrives on the timetable: more than half a day, so not a connection we count.