1st You are asking about theft of goods and services. 2. Amex and Delta have a very close relationship. How close? Amex computers are tied into Delta's computers when it comes to Delta Sky Miles so I would not at all be surprised if it extended to lounge access. 3. I think you need to ask yourself if this is right from a moral standpoint even though it is obviously illegal. I am not claiming I am a saint but it just is a little disturbing.