longest flight?

From:         "V. Venkatesh" <vangal@u.washington.edu>
Organization: University of Washington
Date:         18 Sep 96 13:50:33 
Followups:    1 2
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Just like to know which flight is the longest scheduled in the world. Is
it United's chicago-hong kong?

BTW another great circle calculator is at
http://www.atinet.org/~steve/cs150/