Not too long to take advantage of this, but if you have a Bank of America credit card and are eligible for the BankAmeriDeals (see
this page for general information about the program) they are offering a Cash Back offer for Economy Comfort
Originally Posted by Bank of America BankAmeriDeals
Earn 10% cash back when you spend between $9 and $180 on your upgrade to Economy Comfort seating! Offer valid one time only.
I had purchased a ticket last week for $300+ and today I received confirmation I got cash back for this offer, I just checked my account and got $18 back, so apparently they can't tell the difference between Economy Comfort upgrade charges and a ticket purchase. You need to sign up for this offer first on the appropriate BankAmeriDeals page in your BofA account.