B6 1238 then B6 1337 at Boston
Austin → Boston → Detroit
Timetable, Boston time
19:45B6 1238 from Austin at the gate
18:15B6 1337 to Detroit leaves the gate
22 h 30 apart on the timetable, overnight
B6 1337 leaves 22 h 30 after B6 1238 arrives on the timetable: more than half a day, so not a connection we count.