AA 3539 then AA 3564 at O'Hare
Moline → Chicago → Roanoke
Timetable, Chicago time
12:36AA 3539 from Moline at the gate
13:29AA 3564 to Roanoke leaves the gate
53 min apart on the timetable
The last days
AA 3539 and AA 3564 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.