Lol they need Japan and that show. BTS is the first non-Japanese artist to hit over 400K SINGLES on the first day because they make handshake events and the biggest Korean acts in Japan like TVXQ and Big Bang don't organize such events. You need to buy all 4 versions of the single to have a "chance" to be picked. Their fans had to buy dozens of singles. That event wasnt for only Airplane pt2, also for the other singles and albums. Thus, stop thinking that they slay Japan because they sell a lot of singles thanks to handshake events.

Also not every group performs in a venue at it's max seating capacity. Tokyo dome's max capacity is 55k and BTS' Tokyo dome concert attendance number was said to be 50k each day, Kyocera dome's max capacity is 51k but BTS' Kyocera dome concert attendance number was said to be 45k each day. Actually I don't even believe it was that much, if you look at the fancams, the stage in Tokyo dome is almost in the middle lol.