AA 527 then UA 3906 at San Francisco
Dallas-Fort Worth → San Francisco → Chicago O'Hare
Timetable, San Francisco time
15:10AA 527 from Dallas-Fort Worth at the gatealso BA 2496, QR 2719, QF 3273, QF 4747
19:30UA 3906 to Chicago O'Hare leaves the gate
4 h 20 apart on the timetable
Today
From the airport’s board at 09:39 San Francisco time
15:10AA 527 due at the gate, no estimate yet
19:30UA 3906 due to leave, no estimate yet
4 h 20 between the gates, on these times
The last days
AA 527 and UA 3906 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.