AA 2644 then CV 251 at O'Hare
Pittsburgh → Chicago → Dallas-Fort Worth
Timetable, Chicago time
09:05AA 2644 from Pittsburgh at the gate
22:10CV 251 to Dallas-Fort Worth leaves the gate
13 h 05 apart on the timetable
CV 251 leaves 13 h 05 after AA 2644 arrives on the timetable: more than half a day, so not a connection we count.