I was browsing airliners.net and i saw this http://www.airliners.net/open.file?id=1085113&size=L&width=1200&height=812&sok=JURER%20%20%28cynpr%20%3D%20%27Gbxlb%20-%20Anevgn%20Vagreangvbany%20%28Arj%20Gbxlb%29%20%28AEG%20%2F%20EWNN%29%27%29%20%20BEQRE%20OL%20cubgb_vq%20QRFP&photo_nr=10
why is there a boeing 737 in Narita?
(sorry for such a long url)
Boeing 737-800's with winglets have considerable range. Providing it had a couple of fuel stops...in Guam for example, it could make the distance.
I don't really know why it was a 737 as they are obviously crafts not designed for such long flights. It may have been a government flight or another special charter...i'm quite sure its not a scheduled flight 😉