AA 945 then B6 1187 at Boston
Washington National → Boston → Los Angeles
Timetable, Boston time
16:54AA 945 from Washington National at the gate
15:45B6 1187 to Los Angeles leaves the gate
22 h 51 apart on the timetable, overnight
B6 1187 leaves 22 h 51 after AA 945 arrives on the timetable: more than half a day, so not a connection we count.