UA 3914 then DE 5052 at San Francisco
Manila → San Francisco → Seattle
Timetable, San Francisco time
09:36UA 3914 from Manila at the gate
10:39DE 5052 to Seattle leaves the gatealso QR 8794
1 h 03 apart on the timetable
The last days
UA 3914 and DE 5052 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.