Question: What did the plane of the pilot that was a scheduled American Airlines domestic transcontinental passenger flight from Washington Dulles International Airport in Dulles, Virginia, to Los Angeles International Airport in Los Angeles, California, crash into?
Context: 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. American Airlines Flight 77 was a scheduled American Airlines domestic transcontinental passenger flight from Washington Dulles International Airport in Dulles, Virginia, to Los Angeles International Airport in Los Angeles, California.  The Boeing 757-223 aircraft serving the flight was hijacked by five men affiliated with al-Qaeda on September 11, 2001, as part of the September 11 attacks.  They deliberately crashed the plane into the Pentagon in Arlington County, Virginia, near Washington, D.C., killing all 64 people on board, including the five hijackers and six crew, as well as 125 people in the building. Charles Frank "Chic" Burlingame III (September 12, 1949 – September 11, 2001) was the pilot of American Airlines Flight 77, the aircraft that was crashed by terrorists into the Pentagon during the September 11, 2001 attacks. American Airlines Flight 11 was a domestic passenger flight that was hijacked by five al-Qaeda members on September 11, 2001, as part of the September 11 attacks.  Mohamed Atta deliberately crashed the plane into the North Tower of the World Trade Center in New York City, killing all 92 people aboard and an unknown number in the building's impact zone.  The aircraft involved, a Boeing 767-223ER, registration N334AA, was flying American Airlines' daily scheduled morning transcontinental service from Logan International Airport, in Boston, Massachusetts, to Los Angeles International Airport, in Los Angeles, California. 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. 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. 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. American Airlines Flight 1 was a domestic, scheduled passenger flight from New York International (Idlewild) Airport (now John F. Kennedy International Airport), to Los Angeles International Airport.  On March 1, 1962, the plane – having just taken off two minutes earlier – rolled over and crashed into a swamp, killing all 87 passengers and eight crew members aboard.  A Civil Aeronautics Board (CAB) investigation determined that a manufacturing defect in the automatic pilot system led to an uncommanded rudder control system input, causing the accident.  A number of notable people died in the crash.  It was the fifth fatal Boeing 707 accident and, at the time, the deadliest. Singapore Airlines Flight 006 (SQ006/SIA006) was a scheduled Singapore Airlines passenger flight from Singapore Changi Airport to Los Angeles International Airport via Chiang Kai-shek International Airport (now Taiwan Taoyuan International Airport) in Taipei, Taiwan.  On 31 October 2000, at 23:17 Taipei local time (15:17 UTC), the Boeing 747-412 operating the flight attempted to take off from the wrong runway at Chiang Kai-shek International Airport during a typhoon.  The aircraft crashed into construction equipment on the runway, killing 83 of the 179 occupants aboard.  As of 2014, the accident is the third-deadliest on Taiwanese soil.  It is also the first and only Singapore Airlines crash to result in fatalities. 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.
Answer: the Pentagon