B6 393 then WN 197 at Denver
Boston → Denver → Dallas
Timetable, Denver time
11:12B6 393 from Boston at the gate
11:05WN 197 to Dallas leaves the gate
23 h 53 apart on the timetable, overnight
WN 197 leaves 23 h 53 after B6 393 arrives on the timetable: more than half a day, so not a connection we count.