AA 2199 then 8C 1231 at Miami
Boston → Miami → San Juan
Timetable, Miami time
20:40AA 2199 from Boston at the gate
15:008C 1231 to San Juan leaves the gate
18 h 20 apart on the timetable, overnight
8C 1231 leaves 18 h 20 after AA 2199 arrives on the timetable: more than half a day, so not a connection we count.