responsible for bulkhead and channel maintenance. The United States Coast Guard deals with issues such as floatable debris, spills, vessel rescues, and counter-terrorism. Both states, and some municipal governments (New York City, in particular), maintain maritime police units. The United States Park Police monitors federal properties. The National Park Service oversees some of the region's historic sites, nature reserves, and parks. The port is a port of entry. The United States Customs and Border Protection (CBP) and Immigration and Customs Enforcement (ICE) regulate international imports and passenger arrivals. The "green lane" program, in which trusted shippers have fewer containers inspected. There are two foreign trade zones in the port: FTZ 1, the first in the nation, established in 1937, on the New York side of the port; and FTZ 49, on the New Jersey side. In March 2006, some of the passenger facilities management was to be transferred to Dubai Ports World. There was considerable controversy over security and ownership by a foreign corporation, particularly one of Arab origin, of a U.S. port operation, despite the fact that the operator was British-based P&O Ports. DP World later sold P&O's American operations to American International Group's asset management division, Global Investment Group, for an undisclosed sum. Seamen's Church Institute of New York and New Jersey, the Teamsters, and the International Longshoremen's Association assist and represent some of the port's mariners and dockworkers. Cargo infrastructure Airports The airports in the Port of New York and New Jersey combine to create the largest airport system in the United States, the second in the world in terms of passenger traffic, and the first in the world in terms of total flight operations. JFK air freight cargo operations make it the busiest in the US. FedEx Express, the world's busiest cargo airline, uses Newark Liberty International Airport as its regional hub. Container terminals There are four container terminals in the port: Howland Hook Marine Terminal Port Jersey Marine Terminal Port Newark-Elizabeth Marine Terminal Red Hook Marine Terminal Terminals are leased to different port operators, such as A. P. Moller-Maersk Group, American Stevedoring, NYCT, and Global Marine Terminal. In June 2010, the Port Authority of New York and New Jersey agreed to purchase from Bayonne of land at the Military Ocean Terminal at Bayonne, indicating that additional container port facilities would be created. The agency is expected to develop a terminal capable of handling the larger