B6 993 then WN 988 at Denver
Boston → Denver → Buffalo
Timetable, Denver time
13:07B6 993 from Boston at the gate
11:50WN 988 to Buffalo leaves the gate
22 h 43 apart on the timetable, overnight
WN 988 leaves 22 h 43 after B6 993 arrives on the timetable: more than half a day, so not a connection we count.