Originally Posted by
yabadoo
Can you pay with a credit card to upgrade to the next class up? Some airlines have the option (like for example Etihad does) where on check in if seats are availble then you can upgrade to J on payment of a discounted amount. Does JAL have this option?
You can pay to upgrade from economy to premium economy, but upgrades from economy to business can only be arranged with JMB miles. (or paying the full fare difference and change fee)