Does amex airport lounge work on lufthansa

I fly to London, frankfurt from NYC quite frequently as well as travel on business for my marketing agency all through the US from JFK to SFO, RDU, and a few others.
do American Express Platinum credit card have access to lufthansa or british airways lounges over seas? it seems I am restricted to only flying Delta / American Airlines overseas to be able to use the airport lounges

- How do I find what partnerships with European airlines there are that enable me to use their lounges?

American Express Platinum does not provide access to partner lounges because it does not provide a membership. It provides nothing more than access to AA, CO, DL and US lounges as explained,if you travel to europe or asia,you can have access to Priority Pass lounge.

To gain admission, simply present your Platinum Card, a government issued ID, and a ticket valid for same-day travel to the club agent in:
American Airlines Admirals Clubs®
Continental Airlines Presidents Clubs®
Delta Sky Clubs
US Airways Clubs®(Note: ticket not required for US Airways Clubs)
Airspace Lounges
Your Spouse and children under age 21, or up to two traveling companions, may join you
NEW: Enroll for Priority Pass Select Access
More International Access - over 600 airport lounges in 100 countries
Access available regardless of which carrier or class you are flying
Guests may enter with you for a fee of $27 per person
To gain admission, simply present your Priority Pass Select Card and airline ticket. (Please note that unlike Platinum Card Access admission, you will need to enroll in Priority Pass Select to gain admission)