AA 518 then AA 2174 at O'Hare
San Diego → Chicago → Charlotte
Timetable, Chicago time
12:42AA 518 from San Diego at the gate
13:22AA 2174 to Charlotte leaves the gate
40 min apart on the timetable
The last days
AA 518 and AA 2174 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.