767

� 767-200ER: This model seats 224 passengers in two classes; 181 passengers under a three-class configuration. � 767-300ER: This model seats 269 in two classes and 218 in three classes and has a range capability of 6,115 nautical miles; � 767-400ER: Seats 304 passengers in two classes, or 245 passengers in a three-class configuration with a range of up to 5,645 nautical miles. � More than 26 airlines use the 767.

pentagen

� Headquarters of the U.S. Department of Defense (Army, Navy and Air Force) � Five-sided building in Arlington County, Virginia, covering 34 acres. � Designed by George Edwin Bergstrom. � Built 1941-43 at a cost of $83 million. � Has five floors and is built of structural steel and reinforced concrete. � Building has five concentric pentagons or rings. � Large concourse within it for Pentagon workers. � One of the world's largest office buildings with three times the floor space of the Empire State Building in New York. � 3.7 million square feet of usable floor space for approximately 23,000 people.

World Trade Centre

� The World Trade Center had two 110-story buildings, known as the "Twin Towers" and five smaller buildings. � Tower One was 1,368 feet (414 meters) tall � Tower Two was 1,362 feet (412 meters) tall � The Twin Towers were the tallest until the Sears Tower surpassed them. � Architects: Minoru Yamaski & Associates and Emery, Roth & Sons. � Built of aluminum and steel. � The foundation of each tower extended more than 70 feet below ground, resting on solid bedrock. � Constructed on six acres of landfill. � The towers were the best known examples of "tube buildings," which are strenghtened by closely spaced columns and beams in the outer walls. � Each tower consisted of 104 passenger elevators and 21,800 windows. � About 50,000 people worked in the complex, which housed the offices of more than 430 businesses from 26 countries. � Completed in 1970. � Automatic window-washing machines cleaned 600,000 square feet of glass.

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