Northwest Airlines, Inc. (often abbreviated NWA) is a subsidiary of Delta Air Lines, Inc., and was a major United States airline. It was headquartered in Eagan, Minnesota, near Minneapolis-St. Paul International Airport in the United States. Northwest had three major hubs in the United States: Detroit Metropolitan Wayne County Airport, Minneapolis-Saint Paul International Airport, and Memphis International Airport. Northwest also operated flights from a small hub in Asia at Narita International Airport near Tokyo and also operated transatlantic flights in cooperation with their partner KLM from Schiphol Airport in Amsterdam. It also had focus city operations at Indianapolis International Airport and Seattle-Tacoma International Airport.