My parents are currently in Miami, with a flight scheduled for the end of the week from MIA to JFK. My father has eight 500-mile upgrades that he got for being a million miler, so I decided to look into the possibility of getting them upgraded to business for their upcoming flight. The AA site says it will cost THREE credits per person, for a total of six. Does that make sense? And furthermore, is that considered "getting your money's worth" for those credits, or is that excessively expensive?