AA 153 then BR 647 at O'Hare
Charlotte → Chicago → Anchorage
Timetable, Chicago time
11:42AA 153 from Charlotte at the gate
12:10BR 647 to Anchorage leaves the gate
28 min apart on the timetable
The last days
AA 153 and BR 647 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.