UA 2449 then AA 2009 at O'Hare
Phoenix → Chicago → Nashville
Timetable, Chicago time
12:39UA 2449 from Phoenix at the gate
13:10AA 2009 to Nashville leaves the gate
31 min apart on the timetable
The last days
UA 2449 and AA 2009 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.