Originally Posted by stimpy
I was referring to reading hours old content. I know for a fact that the pages I read on sites such as ESPN or Flyertalk are not cached more than a few seconds, if that.
Dynamic content is never cached. Most of these news sites use dynamic content, which is generated by scripts. There are also automatic ways for sites to tell downstream providers not to cache documents that are retrieved.
Flyertalk, in particular, is a script based site/forum. Since a script generates the pages, it's pulled fresh each time you request it.