AA 250 then QF 7552 at O'Hare
Mexico City → Chicago → Los Angeles
Timetable, Chicago time
18:59AA 250 from Mexico City at the gate
18:50QF 7552 to Los Angeles leaves the gate
23 h 51 apart on the timetable, overnight
QF 7552 leaves 23 h 51 after AA 250 arrives on the timetable: more than half a day, so not a connection we count.