AA 642 then CV 251 at O'Hare
Los Angeles → Chicago → Dallas-Fort Worth
Timetable, Chicago time
07:05AA 642 from Los Angeles at the gate
22:10CV 251 to Dallas-Fort Worth leaves the gate
15 h 05 apart on the timetable
CV 251 leaves 15 h 05 after AA 642 arrives on the timetable: more than half a day, so not a connection we count.