Refueling stop before heading further west?
Why was it over here though?
To move something big
There have been other large cargo flights to Austin recently for what is believed to be Formula 1 race support.
While this wasn’t Austin, maybe it’s related?
Doubt it - no F1 teams are based in Japan. Was probably some large piece of machinery.
That’s not fair! It wasn’t going to Japan when I posted that. 
Does anybody know where it came from when it arrived in Texas?
Originally came from Glasgow - see the history here for that particular plane: