Third-Quarter Loss \$3.4 Billion for MCI MCI Inc. Thursday reported a loss of \$3.4 billion during its third quarter, reflecting its recent decision to write down the value of its telecommunications network.&lt;BR&gt;\&lt;FONT face="verdana,MS Sans Serif,arial,helvetica" size="-2"\ color="#666666"&gt;&lt;B&gt;-The Washington Post&lt;/B&gt;&lt;/FONT&gt;