A JFK/AMS roundtrip in coach leaving on FL 642 JFK/AMS on 4/10/03 would cost $2,507.54 and could only be booked by an NWA Elite member since the flight is oversold.
All seats on the flight have been assigned. The overbooked passengers w/o seat assignments will probably not get seats since there are none to give.
If you decide to give up your seats/reroute it will be almost impossible to find another NWA flight to AMS on April 10th. Flights are full from most of the US gateways.
Good Luck!
RC