DL 9951 then B6 1396 at Atlanta
Queretaro → Atlanta → Boston
Timetable, Atlanta time
20:38DL 9951 from Queretaro at the gate
16:49B6 1396 to Boston leaves the gate
20 h 11 apart on the timetable, overnight
B6 1396 leaves 20 h 11 after DL 9951 arrives on the timetable: more than half a day, so not a connection we count.