AA 9921 then K4 221 at O'Hare
Phoenix → Chicago → Cincinnati Northern Kentucky
Timetable, Chicago time
16:00AA 9921 from Phoenix at the gate
16:20K4 221 to Cincinnati Northern Kentucky leaves the gate
20 min apart on the timetable
The last days
AA 9921 and K4 221 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.