AA 363 then CV 251 at O'Hare
St Louis → Chicago → Dallas-Fort Worth
Timetable, Chicago time
06:29AA 363 from St Louis at the gate
22:10CV 251 to Dallas-Fort Worth leaves the gate
15 h 41 apart on the timetable
CV 251 leaves 15 h 41 after AA 363 arrives on the timetable: more than half a day, so not a connection we count.