It was an AM flight on AM metal. Looks like AM has no arrangment. I am just use to having lounge access, in fact last year I had Delta Skyclub access out of JFK flying AM. They told me that if I had been flying Delta to MEX I would not have had access unless it was Delta One but any other airline gets access as long as it is a premium cabin. Also, I flew AM out of CDG years ago and AF gave me lounge access. I just thought the same rules applied everywhere in the network. It does with Delta...as long as you are on a Skyteam interantion flight in business class you get access to their entire network of lounges.