Originally Posted by
FlyingTrojan
Totally unsubstantiated speculation:
In the new AAdvantage materials, it looks like there are four colors for AAdvantage cards. Perhaps the black card is the new CK card and they will roll out this higher formal level.
Are you talking about how the EXP card appeared to be a dark silver color for a day or two after the rebranding but is now black? I assumed it was just a design error.