DL 5680 then B6 777 at Boston
Pittsburgh → Boston → Las Vegas
Timetable, Boston time
20:47DL 5680 from Pittsburgh at the gate
20:40B6 777 to Las Vegas leaves the gate
23 h 53 apart on the timetable, overnight
B6 777 leaves 23 h 53 after DL 5680 arrives on the timetable: more than half a day, so not a connection we count.