AA 3539 then 5Y 853 at O'Hare
Moline → Chicago → Anchorage
Timetable, Chicago time
12:36AA 3539 from Moline at the gate
13:155Y 853 to Anchorage leaves the gate
39 min apart on the timetable
The last days
AA 3539 and 5Y 853 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.