AA 1951 then B6 1487 at Boston
Chicago O'Hare → Boston → Los Angeles
Timetable, Boston time
09:29AA 1951 from Chicago O'Hare at the gate
09:05B6 1487 to Los Angeles leaves the gate
23 h 36 apart on the timetable, overnight
B6 1487 leaves 23 h 36 after AA 1951 arrives on the timetable: more than half a day, so not a connection we count.