here's the KLM and NWA 747s from the USA arriving at AMS between 10AM tomorrow and 10AM thursday:
KLM 744s operate from LAX, JFK
KLM 743 (or 742SUD) from SFO
NWA 742 from Dallas and Mineapolis
KLM 744 from Mineapolis
NWA (probably) 744 from JFK
NWA 744 from San Diego
NWA 742 from Indianapolis
I've heard LHR is tough for changing planes, especially if you need to change terminals (not sure if that applies if you fly in from the USA, flights to AMS leave from terminal 4).
UA also flies direct to AMS from several destinations in the USA.
Same day and time:
772 from Washington and Chicago once a day each.
DL flies 763s from Atlanta and JFK once a day each.
CO flies a 762 once a day from Newark.
There is a hotelguide on http://www.amsterdam.nl