AA never operated to AMS. They complained that the combined KL/NW force was too big and that yields at AMS don't justify a service to AMS (therefore, only codeshare with BD).
As for TW they haven't flown AMS-STL as far as I know. AMS did have AMS-JFK (Tristar, B767 and sometimes a B747) but I've never heard of an AMS-STL service. Currently TW codeshares with RJ (AMS-JFK) and KU (AMS-ORD).
PA served AMS for many years. They've operated the B707, B747, B727 and A310 to AMS. I duess that the B747 and 707 flew on AMS-JFK (I've only seen pictures of these planes). The B727 flew AMS-LHR and onward to DTW (after a plane change at LHR). This was one of the reasons why it took so long before KLM gained traffic rights on AMS-DTW. After PA lossed the LHR hub the began flying the A310 to JFK.
DL flies AMS-ATL for many years now. The flight is currently a MD-11 , but will become a B767 in June. After the collapse of PA, DL took over PA's AMS-JFK flight and used an A310 on this route. Currently the B767 operates AMS-JFK.
United now flies AMS-LHR (B767 onward to SFO), AMS-ORD (B777) and AMS-IAD (B777). They used to fly AMS-LHR with a B727 (the flight taken over from PA).
Finally, US returned a couple of weeks ago to AMS with a B767 to fly AMS-PHL.