CA 987 then BR 619 at LAX
Beijing → Los Angeles → Taipei
Timetable, Los Angeles time
10:00CA 987 from Beijing at the gate
14:20BR 619 to Taipei leaves the gate
4 h 20 apart on the timetable
The last days
CA 987 and BR 619 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.