Boeing 747 variants

From:         skul_ltd@uhura.cc.rochester.edu (7th Ragged Tiger)
Organization: University of Rochester - Rochester, New York
Date:         16 Sep 94 04:30:20 
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Just a question for anyone who knows:

What exactly are the differences between a 747-100 and a 747-200?
And, between a 747-300 and 747-400?  I know KLM likes using the 747-300
Combi, fir passengers and cargo, especially on the western USA/Canada to 
Amsterdam flights and once I heard of it on the Jo'burg to Amsterdam flight.
I have never been in one, myself.  I have only been on the 100, 200 and 400.

Also, is the 777 double decker or is it only bigger than an Airbus?


Thanks,

Seemant

PS please reply by e-mail if this is a FAQ..