IT 552 then UA 852 at Taipei
Da Nang → Taipei → San Francisco
Timetable, Taipei time
23:15IT 552 from Da Nang at the gate
23:20UA 852 to San Francisco leaves the gate
5 min apart on the timetable
The last days
IT 552 and UA 852 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.