Question: When did the Douglas DC-8 a four -engine long range jet airliner flying from New Orleans International Airport to Washington Dulles International Airport crash?

Context paragraphs:
Eastern Air Lines Flight 304: Eastern Air Lines Flight 304, a Douglas DC-8 flying from New Orleans International Airport to Washington Dulles International Airport, crashed on February 25, 1964.  All 51 passengers and 7 crew were killed.  Among the dead were American opera singer and actor Kenneth Lee Spencer and Marie-Hélène Lefaucheux, a women's and human rights activist and member of the French delegation to the United Nations.

Douglas DC-8 (piston airliner): The Douglas DC-8 was a piston-engined airliner project by Douglas Aircraft.  A concept developed more than a decade before the Douglas DC-8 jetliner, the piston-engined DC-8 was to have propellers in the tail, an idea first used at Douglas by Edward F. Burton on a fighter project.  The airliner project was canceled after development costs made it not commercially viable.

Douglas DC-8: The Douglas DC-8 (also known as the McDonnell Douglas DC-8) is a four-engine long-range narrow-body jet airliner built from 1958 to 1972 by the Douglas Aircraft Company.  Launched after the competing Boeing 707, the DC-8 nevertheless kept Douglas in a strong position in the airliner market, and remained in production until 1972 when it began to be superseded by larger wide-body designs, including the Boeing 747, McDonnell Douglas DC-10 and Lockheed L-1011 TriStar.  The DC-8's design allowed it a slightly larger cargo capacity than the 707 and some re-engined DC-8s are still in use as freighters.

Washington Dulles International Airport: Washington Dulles International Airport (IATA: IAD, ICAO: KIAD, FAA LID: IAD) is an international airport in Loudoun and Fairfax counties in Virginia, United States, 26 miles (42 km) west of downtown Washington, D.C. The airport serves the Baltimore–Washington metropolitan area, centered on the District of Columbia.  The airport is named after John Foster Dulles, the 52nd Secretary of State who served under President Dwight D. Eisenhower.  The Dulles main terminal is a well-known landmark designed by Eero Saarinen.  Operated by the Metropolitan Washington Airports Authority, Dulles Airport occupies 13,000 acres (52.6 km) straddling the Loudoun-Fairfax line.  Most of the airport is in the unincorporated community of Dulles, in Loudoun County, with a small portion in the unincorporated community of Chantilly in Fairfax County.

Dulles Town Center: The Dulles Town Center (DTC) is a two-level enclosed shopping mall in Dulles, Loudoun County, Virginia, United States, located five miles north of the Washington Dulles International Airport.  The retail center gives its name to the census-designated place (CDP) within which it is located.  It encompasses 1400000 sqft of GLA and is the largest enclosed shopping center in Loudoun County.  The mall caters to the burgeoning and affluent population of eastern Loudoun and western Fairfax counties.  Dulles Town Center is anchored by Dick's Sporting Goods, J.C. Penney, Lord and Taylor, Macy's, Nordstrom, Sears and features an eclectic mix of upscale retailers such as Abercrombie & Fitch, Banana Republic, and LOFT.  In addition, the mall has been a launch pad for international retailers emerging into the U.S. market.  High-end New Zealand children's store Pumpkin Patch opened its second U.S. store and German restaurant chain Vapiano opened its third U.S. location at Dulles Town Center in 2007.  In 2015, Vapiano closed down and it's former spot is now unoccupied in the mall.

Virginia State Route 267: State Route 267 is a primary state highway in the US state of Virginia.  It consists of two end-to-end toll roads – the Dulles Toll Road and Dulles Greenway – as well as the Dulles Access Road, which lies in the median of Dulles Toll Road and then extends east to Falls Church.  The combined roadway provides a toll road for commuting and a free road for access to Washington Dulles International Airport.  The three sections are operated and maintained by separate agencies: Dulles Toll Road and Dulles Access Road are maintained by the Metropolitan Washington Airports Authority (MWAA); the Dulles Greenway is owned by TRIPP II, a limited partnership, but is maintained by Macquarie Atlas Roads, an Australian company which owns the majority stake in the partnership.  The Dulles Access Road's median hosts the Silver Line of the Washington Metro for much of the length between Reston and Falls Church.

Louis Armstrong New Orleans International Airport: Louis Armstrong New Orleans International Airport (IATA: MSY, ICAO: KMSY, FAA LID: MSY) is an international airport in Jefferson Parish, Louisiana, United States.  It is owned by the city of New Orleans and is 11 miles west of downtown New Orleans.  The airport's address is 900 Airline Drive in Kenner, Louisiana.  A small portion of Runway 11/29 is in unincorporated St. Charles Parish.  Armstrong International is the primary commercial airport for the New Orleans metropolitan area and southeast Louisiana.  The airport was formerly known as Moisant Field, and it is also known as Louis Armstrong International Airport and New Orleans International Airport.

Air Wisconsin: Air Wisconsin Airlines is a regional airline based at Appleton International Airport in the town of Greenville, Wisconsin, United States, near Appleton.  Air Wisconsin is the largest privately held regional airline in the United States.  It currently operates regional jet flights as American Eagle under contract to American Airlines via a code sharing agreement, serving cities in the U.S. and Canada with hubs at Boston Logan International Airport (BOS), Charlotte Douglas International Airport (CLT), Philadelphia International Airport (PHL) and Ronald Reagan Washington National Airport (DCA) .  Air Wisconsin previously operated United Express service on behalf of United Airlines followed by US Airways Express service on behalf of US Airways prior to becoming an American Eagle regional air carrier.  The company has announced it will once again partner with United Airlines as a United Express code sharing air carrier with primary hubs to be located at Chicago O'Hare International Airport (ORD) and Washington Dulles International Airport (IAD) beginning in September 2017 and will be "exclusively operating" as United Express by March 2018.

USAfrica Airways: USAfrica Airways was a United States-based airline that operated flights between Washington Dulles International Airport (then called Dulles International Airport) and Johannesburg in starting in June, 1994.  Its headquarters was in Reston, Virginia, and it had an office in Washington, DC.

Dulles International Airport station: Dulles International Airport is a planned Washington Metro station at Washington Dulles International Airport in Loudoun County, Virginia on the Silver Line.  It is scheduled to begin operation in 2020, linking Dulles by rail to Washington, D.C. and Ronald Reagan Washington National Airport via Rosslyn.  The station was originally planned to be underground, and feature a tunnel to the Dulles baggage claim area.  Current plans call for an above-ground station next to daily parking garage 1.

Supporting paragraphs: Eastern Air Lines Flight 304 Douglas DC-8
Answer: February 25, 1964