WN 864 then WN 988 at Denver
Burbank → Denver → Buffalo
Timetable, Denver time
16:35WN 864 from Burbank at the gate
11:50WN 988 to Buffalo leaves the gate
19 h 15 apart on the timetable, overnight
WN 988 leaves 19 h 15 after WN 864 arrives on the timetable: more than half a day, so not a connection we count.