AA 3620 then AA 2537 at O'Hare
Huntsville → Chicago → Tucson
Timetable, Chicago time
08:30AA 3620 from Huntsville at the gate
11:45AA 2537 to Tucson leaves the gate
3 h 15 apart on the timetable
The last days
AA 3620 and AA 2537 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.