B6 393 then WN 1749 at Denver
Boston → Denver → Dallas
Timetable, Denver time
11:47B6 393 from Boston at the gate
05:35WN 1749 to Dallas leaves the gate
17 h 48 apart on the timetable, overnight
WN 1749 leaves 17 h 48 after B6 393 arrives on the timetable: more than half a day, so not a connection we count.