AA 363 then AA 4955 at O'Hare
St Louis → Chicago → Des Moines
Timetable, Chicago time
06:29AA 363 from St Louis at the gate
07:17AA 4955 to Des Moines leaves the gate
48 min apart on the timetable
The last days
AA 363 and AA 4955 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.