DL 639 then B6 2321 at Boston
Los Angeles → Boston → West Palm Beach
Timetable, Boston time
15:10DL 639 from Los Angeles at the gate
15:00B6 2321 to West Palm Beach leaves the gate
23 h 50 apart on the timetable, overnight
B6 2321 leaves 23 h 50 after DL 639 arrives on the timetable: more than half a day, so not a connection we count.