Supplemental benefits of traveling business class with JAL contain an extra checked bag allowance, in-flight extras like slippers and sound-canceling headphones, and attentive company from the flight attendants. Also, once we boarded the taxi/wait around time was also prolonged, with the pilot blaming “development at SFO” for that hold off, https://businessflightshop.co.uk/blog/difference-between-first-class-flights-and-economy-class-flights/