AA 2359 then CV 251 at O'Hare
Buffalo → Chicago → Dallas-Fort Worth
Timetable, Chicago time
09:05AA 2359 from Buffalo 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 2359 arrives on the timetable: more than half a day, so not a connection we count.