When I first saw How the Lord of the Rings
Should Have Ended, I though, “Yeah, why didn't they use the
giant eagles to fly the Ring to Mount Doom?”
One of the arguments I've heard is that the Nazgûls' fell beasts would have
taken out the giant Eagles once they entered into Mordor.  But Sean Chist felt
otherwise—he thinks it's a plot hole left by Tolkien (link via Hacker
News).
But personally, I find this
theory much more plausible and a much better explanation for why
“Operation: AirDrop One” wasn't done.
 
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