UA 1783 then DL 5665 at Boston
Los Angeles → Boston → Richmond
Timetable, Boston time
16:53UA 1783 from Los Angeles at the gate
15:20DL 5665 to Richmond leaves the gate
22 h 27 apart on the timetable, overnight
DL 5665 leaves 22 h 27 after UA 1783 arrives on the timetable: more than half a day, so not a connection we count.