DL 499 then B6 1187 at Boston
Denver → Boston → Los Angeles
Timetable, Boston time
17:27DL 499 from Denver at the gate
15:45B6 1187 to Los Angeles leaves the gate
22 h 18 apart on the timetable, overnight
B6 1187 leaves 22 h 18 after DL 499 arrives on the timetable: more than half a day, so not a connection we count.