Originally Posted by
flydeu
You are right the sample is small, but I had noticed similar patterns in the past - I had also heard the USD conversion stage may give rise to problems.
I am - based on that sample size - not really sure if its Amex practice or only a matter of time & settlement. Dontīt know the exact cut-off time of each transaction but I think that credit card conversion rates are settled ONCE per day.
So the time should be different for e.g. the Lufthansa/Sparkasse Mastercard (account statements printed in Passau, Germany) and the cut-off date of the Amex accounting. Donīt know where there accounting is based but if it would be in London or US this would explain that they are as the case may be one day forward or later.
Donīt think they are worse in respect of currency rates. But remember that they are BETTER in respect of piling up membership rewards points.
Hope this helps.