UA 2012 then WN 1209 at Denver
Baltimore → Denver → Raleigh-Durham
Timetable, Denver time
18:25UA 2012 from Baltimore at the gate
17:55WN 1209 to Raleigh-Durham leaves the gate
23 h 30 apart on the timetable, overnight
WN 1209 leaves 23 h 30 after UA 2012 arrives on the timetable: more than half a day, so not a connection we count.