AA 2247 then MQ 3676 at Miami
Boston → Miami → Cincinnati
Timetable, Miami time
17:50AA 2247 from Boston at the gate
17:10MQ 3676 to Cincinnati leaves the gate
23 h 20 apart on the timetable, overnight
MQ 3676 leaves 23 h 20 after AA 2247 arrives on the timetable: more than half a day, so not a connection we count.