I was in Osaka once, the junior guy in a 4-man crew for KIX-MEM.

Did the walkaround and found a pretty big oil leak on #3 (new engine). A little research showed the thing had burned 3 quarts from SIN to KIX.

Long story short, took them 5 hours to find the leak - they had to run it at takeoff power out on the runway. Lord knows what that cost the company - we missed the sort in MEM.....