Originally Posted by
BER Flyer
On my last flight through CDG last week ( Terminal 2 M Gates ) i saw a relativly large sign saying "Want to upgrade your long-haul flight into Business class? Inquire here!" and i thought they might now use the same approach as KL in Amsterdam ( which lets you upgrade ANY fare into business with miles & cash ).
Indeed, but this is a different approach and not guaranteed. If you want to be sure to fly in J (in advance), then you change your ticket, pay the difference in fare + change fees. This will be expensive in the OP's case but he's sure to fly J if that's what he wants.
Or you wait to see at the airport or at OLCI if you can benefit of a targeted paid upgrade as you suggested. It will be cheaper but, from Y to J, you can expect something around 600-700 Euros one-way and no guarantee at all.