The Southern Tier Expressway – Interstate 86 and New York State Route 17 – serves the Southern Tier. The highway is the region's major corridor and connects to U.S. Route 219 in Salamanca, Interstate 390 in Bath, Interstate 99 in Corning, U.S. Route 220 in Waverly, and Interstates 81 and 88 in Binghamton. The region is served by three regional airports. Elmira-Corning Regional Airport has routes to Atlanta, Washington D.C., Detroit, and several destinations in Florida. The Greater Binghamton Airport offers Delta Airlines flights to Detroit. Chautauqua County-Jamestown Airport connects to Pittsburgh via Essential Air Service. Bus service is provided along the entire I-86/NY 17 corridor by Coach USA's Shortline/Erie services from Jamestown to New York City and Buffalo, and Trailways connects the Southern Tier with Buffalo, Dubois (at the western end in Salamanca), Sunbury/Lock Haven (at Elmira), and Syracuse, Albany and Harrisburg (at Binghamton). A somewhat unorganized network of municipally operated public transportation services operate local and limited intercity bus services between Salamanca and Elmira. Until the demise of long-distance passenger rail service in the United States in the 1950s and 1960s, the Erie Railroad operated passenger trains in the region, with Chicago, Illinois as the western terminus and Jersey City, New Jersey as the eastern terminus, with ferry connections to New York City. Amtrak currently does not serve the area. Proposals for high-speed rail in New York have included a route from Binghamton to New York City through Scranton, Pennsylvania, a route that could at least partially be upgraded for high-speed rail. As of 2011, the highest priority for high-speed rail projects in New York is in the Empire Corridor, of which no part crosses the Southern Tier. The hilly terrain of the Southern Tier's I-86 corridor is not ideal for high-speed rail service, especially compared to the relatively flat and straight land in the Empire Corridor. Government services are the largest employer in the area. Of second and declining importance is manufacturing. The region's manufacturing economy has suffered for decades, but factories are found in the region's larger communities. Fortune 500 materials maker Corning Inc. is headquartered in Steuben County. Broome County has a large high-tech industry, and is the birthplace of IBM and flight simulation. In addition, other factories in the region make military aircraft, televisions, furniture, metal forgings and machine tools.