Obviously the eagles could fly to Mt. Doom, because they flew there to pick up Frodo and Sam after the ring was destroyed. I believe Harad is correct that the reason the eagles didn't do it is that there would be no story if they did.
Nevertheless, it seems to me to be a flaw in the story. Unless Middle-earth was populated by idiots, it is logical that someone would have said something like, "Hey, Gandalf, the eagle carried you away from Orthanc, let's see if the eagles would help us in the quest to destroy the ring."
Nevertheless, it seems to me to be a flaw in the story. Unless Middle-earth was populated by idiots, it is logical that someone would have said something like, "Hey, Gandalf, the eagle carried you away from Orthanc, let's see if the eagles would help us in the quest to destroy the ring."
