They preset my Amex Platinum limit to $4400 at the peak of the financial crisis last year and then changed it back to NPSL early this year. Upon restoration, they sent me a letter confirming the change back to NPSL and added that transactions up to $37k would be approved without further review needed or something to that effect.
Their internal scoring and risk assesment is too cryptic and mind bending, I don't even bother trying to figure them out anymore. You can be late on a payment or two with them and see no effect but mess around with accounts from other issuers and they will be quick to the trigger with CLD's, FRA's, hard limits on charge cards, etc.
