QF 7521 then AA 6487 at O'Hare
Anchorage → Chicago → St Louis
Timetable, Chicago time
10:15QF 7521 from Anchorage at the gate
15:18AA 6487 to St Louis leaves the gate
5 h 03 apart on the timetable
The last days
QF 7521 and AA 6487 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.