AA 2009 then AA 1173 at O'Hare
Nashville → Chicago → Pittsburgh
Timetable, Chicago time
17:43AA 2009 from Nashville at the gate
18:30AA 1173 to Pittsburgh leaves the gate
47 min apart on the timetable
The last days
AA 2009 and AA 1173 weren’t both flown 15 min to 12 h apart in the last 21 days.
Statistics from past flights, not live flight information. Always check times and your connection with your airline, and don’t base travel or booking decisions on these numbers.