American AAdvantage adds fuel surcharges to awards on British Airways and Iberia. They’re fairly de minimis for Iberia flights, but for British Airways it makes awards too costly to often be worth it. For coach tickets it’s silly, you pay almost as much as a ticket costs. For premium cabin tickets it’s like paying for a coach ticket and using miles to upgrade, but earning neither miles nor status despite the huge cash co-pay.
That’s bad enough, but on many routes American actually overcharges for these surcharges. And they only fix it and refund customers when caught with their hand in the cookie jar.