I have access to what they say is the current international fee schedule on our website. All I do is add the US fees of $17 to the numbers they give us.
TXL recently was $42, ATH was $65ish, IST was $32sh+$20 visa on arrival, VCE was $27, OTP was $17, BUD $39.

By far, UK is the worst and I also understand that if you ask for Business class and pay the $80L you don't get refund difference if you have to sit coach, BUT if you pay coach you DO have to pay the diff to move up to Biz.

Try BRU or AMS $25ish--no idea about CDG since we have to use scrub passes and are not charged