I CANNOT BELIEVE WHAT JUST HAPPENED TO ME. THANK YOU OP. THANK YOU MYFICO FORUM. This thread along with this one tonight gave me the courage to "give it a shot." I was a bit nervous and felt a bit funny but BINGO!
http://ficoforums.myfico.com/t5/Credit-Cards/Amex-Backdating-Success/td-p/3159128
WhiteSOL, I dont think it matters if it's personal, business, or corporate. It's based on what you request. In my case I had an AMEX corporate card almost two decades ago. I can't recall if it was charged off or paid off. But based on my conversation with the CSR I don't think she had any idea or reference to my prior account with AMEX.
( PLEASE for your eyes only.. names have been changed for privacy )
info: Welcome to American Express Live Chat! The next available Customer Care Professional will be with you shortly.
For quality assurance, this chat may be recorded and monitored. For your security, please click “END CHAT X” to close this chat window before leaving your computer unattended or when chat is complete. Your estimated wait time is 0 minutes and 1 seconds.
info: You are now chatting with Anne.
Anne: Hi, welcome to American Express Chat. My name is Anne. How can I help you today?
you: Hello Anne. I would like to request a correction to my membership since date. My very first account with American express was back in 1995.
you: So I would like all three of my current cards to have that date as member since date.
Anne: I will do that for you with pleasure.
Anne: I am sorry for the incorrect update.
you: it's okay I did not realize it until I had time to look at them.
you: 
Anne: (smile)
Anne: Let me quickly submit your request.
Anne: Am I chatting with Fico2Go?
you: yes
Anne: Thank you.
Anne: Would you like us to send the card with correct via standard delivery option?
you: yes please .. I will be traveling in two weeks. Is there a faster way?
Anne: Sure.
Anne: Let me make an arrangement for sooner card delivery.
Anne: Thank you for waiting.
Anne: I have successfully submitted your request. You can use your card till you receive the new one.
you: Fantastic! So I will be receiving three new cards soon?
Anne: I have submitted your request for the fist card.
you: I'm sorry to inconvenience u for the three requests.
Anne: I am sorry, I though it is incorrect only on one of the card.
Anne: No problem at all.
Anne: Let me process the request for other two cards.
you: it is on all three. They all have the incorrect year.
Anne: Please do not worry at all.
Anne: I will take care of all three cards.
you: I am happy with American express. Not leaving home without it.
you:
Anne: (smile)
Anne: I am also done with the second card.
Anne: Going for third one.
Anne: I have successfully submitted your request for all three cards.
Anne: So yes, you will now receive three different cards.
you: Fantastic! Will I be receiving all three cards in one envelop or separately?
Anne: They may be in three different package.
you: OK
you: Well Anne. Thank you for your responsiveness. You have a wonderful evening!
Anne: you too.
Anne: Have an excellent day ahead and take care fico2go (smile).
Anne: It was a pleasure to assist you today, please click here to end this chat and take a brief survey.
