Japan is one of the places where it is easy to find a Boeing 777-300. The 777-200 sold in good numbers and Boeing stretched the airframe to create the -300. It was not a big seller but was picked up in the Asian market where capacity was important but range was not such a concern. When Boeing launched the 777-300ER, they unlocked the range and payload capabilities that were in demand and it sold very well – usurping the 747 as the long range high capacity jet of choice.
The -300 has been retired from some of its original operators but Japan Air Lines still flies them. They are most easily identified by the original wingtip shape as opposed to the rake tip that the 300ER has. They also have the original engine choices as opposed to the GE-90 only 300ER. I saw some at Haneda and grabbed some shots. With the A350s joint the JAL fleet, I wonder whether the 777-300s will soon be heading to the yard.