WN 4725 then B6 1187 at Boston
Baltimore → Boston → Los Angeles
Timetable, Boston time
08:05WN 4725 from Baltimore at the gate
20:30B6 1187 to Los Angeles leaves the gate
12 h 25 apart on the timetable
B6 1187 leaves 12 h 25 after WN 4725 arrives on the timetable: more than half a day, so not a connection we count.