How many parts are in a Boeing 747-400 airplane, and how many pounds
does each wing weigh?

eg134109,
   This information has been provided by Boeing itself.

1)A 747-400 has six million parts, half of which are fasteners. 
2)The 747-400 wing weighs 95,000 pounds (43,090 kg), more than 30
times the weight of the first Boeing airplane, the 1916 B&W.
http://www.boeing.com/commercial/747family/pf/pf_facts.html

Another comprehensive source of information about Boeing 747 says
A 747-400 has six million parts (half of which are fasteners) made in
33 different countries
http://en.wikipedia.org/wiki/Boeing_747

Search strategy:
"Boeing 747-400" +"fun facts"
"Boeing 747-400" +parts

-ddhara

Found this on the following web site:

http://www.boeing.com/commercial/747family/pf/pf_facts.html

That was easy...maybe I can be a Google Researcher some day.

Ed.

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747 Fun Facts 
  
Parts 
A 747-400 has six million parts, half of which are fasteners. 
A 747-400 has 171 miles (274 km) of wiring and 5 miles (8 km) of tubing. 
A 747-400 consists of 147,000 pounds (66,150 kg) of high-strength aluminum. 
The 747-400 has 16 main landing gear tires and two nose landing gear tires. 
The 747-400 tail height is 63 feet 8 inches (19.4 m), equivalent to a
six-story building.
Wings

The 747-400 wing weighs 95,000 pounds (43,090 kg), more than 30 times
the weight of the first Boeing airplane, the 1916 B&W.
The 747-400 wing measures 5,600 square feet (524.9 m 2 ), an area
large enough to hold 45 medium-sized automobiles.
Four World War I vintage JN4-D ?Jenny? airplanes could be lined up on
each of the Boeing 747 wings.
How much weight does an additional 6-foot (1.8-m) wingtip extension
and winglet add to the 747-400 wing? None! A weight savings of
approximately 5,000 pounds (2,270 kg) was achieved in the wing by
using new aluminum alloys, which offset the weight increase of the
wing tip extension and winglet