<fo:table-body>
  <fo:table-row>
    <fo:table-cell width="2.5in">AAA</fo:table-cell>
    <fo:table-cell width="2.5in">BBB</fo:table-cell>
  </fo:table-row>

don't you want 

<fo:table-column column-width="2.5in"/>
<fo:table-column column-width="2.5in"/>

before that table body?

David

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