AA 3294 then AS 257 at Boston
Charlotte → Boston → Seattle
Timetable, Boston time
19:10AA 3294 from Charlotte at the gate
16:33AS 257 to Seattle leaves the gate
21 h 23 apart on the timetable, overnight
AS 257 leaves 21 h 23 after AA 3294 arrives on the timetable: more than half a day, so not a connection we count.