WN 3667 then AS 257 at Boston
St Louis → Boston → Seattle
Timetable, Boston time
16:50WN 3667 from St Louis at the gate
16:33AS 257 to Seattle leaves the gate
23 h 43 apart on the timetable, overnight
AS 257 leaves 23 h 43 after WN 3667 arrives on the timetable: more than half a day, so not a connection we count.