F9 1407 then B6 1396 at Atlanta
Buffalo → Atlanta → Boston
Timetable, Atlanta time
16:18F9 1407 from Buffalo at the gate
15:38B6 1396 to Boston leaves the gate
23 h 20 apart on the timetable, overnight
B6 1396 leaves 23 h 20 after F9 1407 arrives on the timetable: more than half a day, so not a connection we count.