DL 1624 then AA 32 at O'Hare
Boston → Chicago → San Diego
Timetable, Chicago time
15:27DL 1624 from Boston at the gate
19:45AA 32 to San Diego leaves the gate
4 h 18 apart on the timetable
The last days
DL 1624 and AA 32 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.