The United States is negotiating to expand Customs and Border Protection preclearance inspections to 10 airports,

including its first in each continental Europe and East Asia, according to the U.S. Department of Homeland Security. Preclearance ushers travelers through inspection prior to departure, rather than upon arrival in the United States. The airports under consideration, pending negotiation with the nine countries, are the United Kingdom's London Heathrow and Manchester airports, Tokyo’s Narita International Airport, Amsterdam, Brussels, Oslo, Madrid, Stockholm, Istanbul and Dominican Republic's Punta Cana. These airports handled 20 million United States-bound travelers in 2014, according to the DHS. Preclearance operates out of 15 airports in Canada, Ireland, Abu Dhabi, Aruba, the Bahamas and Bermuda.