AA 4381 then AA 3134 at O'Hare
Grand Rapids → Chicago → San Diego
Timetable, Chicago time
06:09AA 4381 from Grand Rapids at the gate
10:04AA 3134 to San Diego leaves the gate
3 h 55 apart on the timetable
The last days
AA 4381 and AA 3134 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.