UA 347 then WN 988 at Denver
Reno → Denver → Buffalo
Timetable, Denver time
12:20UA 347 from Reno at the gate
11:50WN 988 to Buffalo leaves the gate
23 h 30 apart on the timetable, overnight
WN 988 leaves 23 h 30 after UA 347 arrives on the timetable: more than half a day, so not a connection we count.