From DFW Airport twitter:
We're feelin' lucky, because
@JAL_Official_jp
is bringing more 777 service to DFW!
Next month, JAL will begin using a 777-300 for their daily route from DFW to Tokyo Haneda, allowing for more passengers and cargo space on every flight. Keep an eye out for the 777 starting 3/26!
Changed from a 789 to a 777-300. We are ticketed in J in April and I went and looked at the seat map and was able to pick F seats. Not sure if they'll end up selling F cabin at some point or how this will be handled. I imagine F hard product with J soft product.