WN 818 then UA 2001 at Denver
Buffalo → Denver → Cedar Rapids
Timetable, Denver time
18:35WN 818 from Buffalo at the gate
18:00UA 2001 to Cedar Rapids leaves the gate
23 h 25 apart on the timetable, overnight
UA 2001 leaves 23 h 25 after WN 818 arrives on the timetable: more than half a day, so not a connection we count.