Why didn't Frodo just fly to mordor on an eagle?

>I posted it again!

Actually, I'm just now re-reading Lord of the Rings, and when Gwaihir the Wind-Lord rescues Gandalf from the top of Orthanc he basically says, "I just came to bring news, not to carry your ass, I'm setting you down." Then on top the silvertine he's like "not again, man, I'll set you down just over there." He seems to plainly not like carrying people, even though Gandalf now is "light as a feather" or something like that. Then, the eagles gather some knowledge of the Nazgul, and why would they want to fight these mounted ring-wraiths essentially unarmed, since their talons would be filled with people they don't even want to carry?

Throughout the books, it seems its pretty easy to get people to agree to token aid (i.e. giving food and a roof, or news) and pretty hard to get people to agree to actually join the war effort. And even so, who's to say they would be able to fly from the outskirts of Mordor to the mountain while carrying people in a day? Where would they stop to land? They'd surely be spotted, and possibly overrun on the ground. Not to mention the nazgul seeing them and stopping them in the air, or just sensing the ring. Honestly, going through the air seems retarded as fuck, no safer from detection or interdiction than just going on the ground, and requiring a large amount of life-risking concession from a free "people" who aren't likely to give that much concession, until they later become convinced of the threat of the nazgul and such themselves.

By the 3rd Age, the valor had agreed not to meddle in middle earth. They raised their undying lands into the sky, and made the earth round. (Yeah it used to be flat; and the sun and moon didn't exist in the 1 & 2 age)

So basically, I've heard it explained that the Eagles belonged to Manwë, one of the valor. They were kinda like Gandalf in that they were spirits on Middle Earth and were limited in the ways they could intervene.

Also, for all we know they could have been susceptible to the ring's corruption as well.

But the real answer is: it would have ruined the story, duh.

>>8521299
The primary reason is that the Eagles are not resistant to the ring and would end up taking it for themselves.

Its the reason Gandalf chose Hobbits to begin with

>>8521299
It's because he's an idiot. Gandalf even told them them to fly just before he fell down the balrog pit.