WN 975 then B6 1337 at Boston
Baltimore → Boston → Detroit
Timetable, Boston time
19:15WN 975 from Baltimore at the gate
18:15B6 1337 to Detroit leaves the gate
23 h apart on the timetable, overnight
B6 1337 leaves 23 h after WN 975 arrives on the timetable: more than half a day, so not a connection we count.