BR 1015 then SL 394 at Taipei
Los Angeles → Taipei → Tokyo Narita
Timetable, Taipei time
05:45BR 1015 from Los Angeles at the gate
12:10SL 394 to Tokyo Narita leaves the gate
6 h 25 apart on the timetable
The last days
BR 1015 and SL 394 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.