Originally Posted by
lovetotravel
When you purchase your ticket with the credit card or use it to pay taxes on an award ticket, it it automatic, no fee is charged.
EDIT: Yes, you do have to use the card, other wise you will be charged.
This was my experience on June 8, taxes charged on the credit card, online check in did not ask for bag fees, when dropping of the bag, agent asked if we paid the bag fee and verified that the system did not ask for it. We kind of wondered, how the system know not to charge us, what was linked to what but it did work for us.