FR 817 then EI 137 at Dublin
Edinburgh → Dublin → Boston
Timetable, Dublin time
19:00FR 817 from Edinburgh at the gate
16:45EI 137 to Boston leaves the gate
21 h 45 apart on the timetable, overnight
EI 137 leaves 21 h 45 after FR 817 arrives on the timetable: more than half a day, so not a connection we count.