Originally Posted by
FlyingBeanCounter
weird. It would be cheaper to book a coach ticket and just take her on my lap in first class.
You can't do that, although you might be able to downgrade your own ticket to coach.
It's 10% of the fare plus 100% of the fees.
BTW, if you have DL operated longhaul international flights, they're business class and not FC. D1 is not a FC product.