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I don't remember seeing any info about this, so I thought I'd share. I recently booked a Delta flight using Skymiles. Delta required me to pay about $15 in addtion to the skymiles used. This triggered my Amex Platinum airline credit (I have Delta chosen) and they credited my account for this charge.
Details on what will trigger the credit for Delta: https://www.flyertalk.com/forum/american-express-membership-rewards/2002965-airline-fee-250-200-100-...