CZ 660 then CA 3423 at Guangzhou
San Francisco → Guangzhou → Xi'an
Timetable, Guangzhou time
10:25CZ 660 from San Francisco at the gate
12:45CA 3423 to Xi'an leaves the gatealso G5 6069, TV 6525, KY 9159, SC 9189
2 h 20 apart on the timetable
The last days
CZ 660 and CA 3423 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.