AA 540 then AA 4933 at O'Hare
Nashville → Chicago → Des Moines
Timetable, Chicago time
11:05AA 540 from Nashville at the gate
11:55AA 4933 to Des Moines leaves the gate
50 min apart on the timetable
The last days
AA 540 and AA 4933 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.