WN 1311 then B6 2255 at Boston
Austin → Boston → Washington National
Timetable, Boston time
18:40WN 1311 from Austin at the gate
18:20B6 2255 to Washington National leaves the gate
23 h 40 apart on the timetable, overnight
B6 2255 leaves 23 h 40 after WN 1311 arrives on the timetable: more than half a day, so not a connection we count.