AA 2998 then UA 5191 at O'Hare
Los Angeles → Chicago → Lancaster
Timetable, Chicago time
15:59AA 2998 from Los Angeles at the gate
08:50UA 5191 to Lancaster leaves the gate
16 h 51 apart on the timetable, overnight
UA 5191 leaves 16 h 51 after AA 2998 arrives on the timetable: more than half a day, so not a connection we count.