BR 619 then VN 577 at Taipei
Los Angeles → Taipei → Hanoi
Timetable, Taipei time
08:40BR 619 from Los Angeles at the gate
13:25VN 577 to Hanoi leaves the gate
4 h 45 apart on the timetable
The last days
BR 619 and VN 577 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.