http://www.nytimes.com/2008/08/30/business/30pipes.html?_r=2&oref=slogin&ref=technology&pagewanted=all
Internet Traffic Begins to Bypass the U.S.
Because of tariffs, pricing anomalies and even corporate cultures,
Internet providers will often not exchange data with their local
competitors. They prefer instead to send and receive traffic with
larger international Internet service providers.
This leads to odd routing arrangements, referred to as tromboning, in
which traffic between two cites in one country will flow through other
nations. In January, when a cable was cut in the Mediterranean,
Egyptian Internet traffic was nearly paralyzed because it was not
being shared by local I.S.P.’s but instead was routed through European
operators.