B6 178 then DL 2804 at Boston
Las Vegas → Boston → Chicago O'Hare
Timetable, Boston time
07:54B6 178 from Las Vegas at the gate
20:55DL 2804 to Chicago O'Hare leaves the gate
13 h 01 apart on the timetable
DL 2804 leaves 13 h 01 after B6 178 arrives on the timetable: more than half a day, so not a connection we count.