CZ 660 then CZ 30 at Guangzhou
San Francisco → Guangzhou → Shanghai Hongqiao
Timetable, Guangzhou time
10:25CZ 660 from San Francisco at the gate
21:15CZ 30 to Shanghai Hongqiao leaves the gatealso CA 3278, MU 3863, 3U 4594, ZH 5202, MF 5750
10 h 50 apart on the timetable
The last days
CZ 660 and CZ 30 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.