The airline has a limit has to weight and volume. International flights from and to the Far East is 70lbs or 32 kgs. A standard manufacturer's bike box meets the size limitation.

I have my reservations 2 bike boxes taped together will meet the required volume. However I see that they are frame boxes which are smaller than the standard complete bicycle box. Go to your airline website and see how they calculate size and girth of check-in luggages.

You are allowed 2 check-in luggages and any excess is charged I believed $150. Provided they meet the airlines max, taping them together saves money.