A quick google shows me that they at least have direct flights to:

KLM:

Atlanta, Chicago, Houston, LA, Miami, Minneapolis, New York (JFK), Salt Lake city, San Francisco, Washington

Delta:

Atlanta, Boston, Detroit, Minneapolis, New York (JFK), Newark, Portland, Salt Lake city, Seattle

United:

Chicago, Houston, Newark, Washington

American:

Dallas/Fort Worth, Philadelphia

TUI (chartered, infrequent)

Miami and Orlando

Posted By: Steve in Holland, May 9, 11:11:35