B6 393 then UA 741 at Denver
Boston → Denver → Bozeman
Timetable, Denver time
11:47B6 393 from Boston at the gate
11:40UA 741 to Bozeman leaves the gate
23 h 53 apart on the timetable, overnight
UA 741 leaves 23 h 53 after B6 393 arrives on the timetable: more than half a day, so not a connection we count.