AA 420 then WN 988 at Denver
Dallas-Fort Worth → Denver → Buffalo
Timetable, Denver time
14:18AA 420 from Dallas-Fort Worth at the gate
11:50WN 988 to Buffalo leaves the gate
21 h 32 apart on the timetable, overnight
WN 988 leaves 21 h 32 after AA 420 arrives on the timetable: more than half a day, so not a connection we count.