Keep in mind that it is based on Q points, not miles, so a discounted ticket in coach is 1/2 point per mile. Just made this mistake on my nephew'w ticket to Rome. Thought it would qualify him for Platinum because I thought the $1000 ticket had to be full fare. NOT. I called AA back and pursuaded them to give him Gold and 25% bonus miles on the return flight. He wasn't sure if he would be getting in enough flights to make Platinum.
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Ms.DtG