Today I checked my points balance on Amex Business Platinum Card to transfer to Cathay Pacific and it would appear that while last week with all transfer partners points were transferred at a rate of 1:1.This week the transfer rate for all partners other than Emirates (4:3) is now 3:2 ie a devaluation of 33% in one hit without warning...time to ditch it.This is after previous devaluation 6 months ago.