DL 9970 then AA 1401 at San Francisco
Seattle → San Francisco → Dallas-Fort Worth
Timetable, San Francisco time
11:15DL 9970 from Seattle at the gate
15:45AA 1401 to Dallas-Fort Worth leaves the gatealso QF 4572
4 h 30 apart on the timetable
The last days
DL 9970 and AA 1401 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.