AA announced ORD-AMS in 1999, only to cancel it.
ORD-AMS is already a crowded market with Northwest/KLM, United, Kuwait Airlines, Singapore Airlines, and I belive Royal Jordanian.
MIA-AMS is also well served with Northwest/KLM and Martinair, with as many as 3 flights a day on Saturdays starting this winter. However, as AA expands thier MIA hub, I do think they might want a piece of the pie in the future, because MIA-AMS is a very dense route. Though that is not until 2005/2006 at the earliest.
There is no DFW-AMS, service, however. That would be the best gateway to start AMS service from.