QR 2137 then AA 939 at San Francisco
Seattle → San Francisco → Dallas-Fort Worth
Timetable, San Francisco time
12:26QR 2137 from Seattle at the gatealso DE 5054, QR 8824
23:23AA 939 to Dallas-Fort Worth leaves the gatealso CZ 1632
10 h 57 apart on the timetable
The last days
QR 2137 and AA 939 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.