Hi kurz,
as far as I know the KLM lounges were previously very often called Rembrandt lounges and as far as I remember KLM had a Rembrandt lounge in YYZ.
For sure I know that they have their own lounge at Houston Bush Interconti ( IAH ) and Dubai ( DXB ).
JFK used to have a Rembrandt lounge as well, but KLM closed it and used the temporary World Club there before switching over to the Aer Lingus club.
BTW, just found a complete directory of the lounges you can use with a KLM Amex Plat card, did not checked it through, but the same lounges should be accessible with a KLM PE card as well, right ?
http://www47.americanexpress.com/cor...ssOverview.pdf