<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by PrivatePilot:
Personal Identification Number (PIN)
Your PIN is unique to your account and is designed to protect your account from unauthorized use. Continental Airlines will not be responsible for any lost, stolen or otherwise disclosed PINs, nor shall it re-credit any mileage withdrawn from your account if anyone seeking mileage redemption provides your PIN. Accordingly, your PIN should be guarded and not provided to anyone other than a Continental Airlines representative...
</font>
By chance are you subscribing to a service that consolidates your bank statements and loyalty reward balances all into one online statement? I know that one of these companies approached the financial institution that I work for, and I declined to investigate it further as it would have required us to ask our customers for their PINs. I do believe that the airlines and hotels don't like that. It's possible that they feel that this may have been done on your account, and may be a way to disclose to you that they're not responsible for fraudulent use of your account.
Just a thought...