American Express Co.
Kenneth I. Chenault
Chairman and CEO
World Financial Center
200 Vesey St.
New York, NY 10285
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It's doubtful that the CEO has a direct consumer channel of communication. However, you can send a certified letter, return receipt request, addressed to his name and attention at the AMEX corporate headquarters.
212-640-2000
Chances are that some designated assistant or dept. will actually open and process the letter, but it is in the same building and has his name on it.
Here is a link to a site that has some AMEX officer/director contact info:
http://www.lead411.com/company_AmericanExpressCompany_Cenult_8974.html
I also found a blog that someone claimed this was Mr. Chenault's email address: chenault@aexp.com or kenneth.I.Chenault@aexp.com
Not sure about it....let us know if it pans out.
Good luck! 
Here is some information on Mr. Chenault and his address.. In my expereince you won't get within a mile of Mr. Chenault taking any personal interest in this issue. They have staff that will handle this and you won't get his personal attention. Many years ago my mother-in-law was on a similar crusade with Chrysler Corporation. She was writing letters to Lee Iaccoca about an issue that was important to her. It may have made her feel better, and she swore off Chrysler products forever, but she got nada out of Chrysler, much less any personal attention of the CEO. To be honest, they have more important things to do than handle individual issues. But it doesn't hurt to try. Unless you are suing the CEO personally AMEX has no obligation to open a direct link between you and the CEO. Good luck.
Kenneth I. Chenault Chairman of the Board, Chief Executive Officer
Held current title since: 2001 Director since: 1997 Officer since: 1997 Age: 57 Mr. Kenneth Chenault is Chairman of the Board of American Express Company since April 2001 and Chief Executive Officer since January 2001 and Director since 1997. He is Director, International Business Machines Corporation and The Procter & Gamble Company. Member, the World Trade Center Memorial Foundation. Trustee, NYU Hospitals Center and the New York University School of Medicine Foundation.
World Financial Center200 Vesey Street
New York, NY 10285
(212) 640-2000
(212) 640-0404
There was a recent post on Consumerist.com where they listed email addresses for 13 AmEx executives - followed by commenters saying that only one of the addresses worked. Someone else then posted that they'd been able to get an email through to ken.chenault@aexp.com - they got a response, but from someone on Ken Chenault's behalf, rather than from the man himself.
Here's the post with all the addresses they listed.
This post is from 2007, but lists phone numbers for AmEx "executive customer service" as well as the "executive secretary's office" - again, not Ken Chenault himself, but maybe better to talk to than a frontline CSR.
I'm sorry they did this to you, Concord. 