Gwaihir physically cannot drop
The Fellowship can't ride eagles to Mordor because of the giant, flying snake-dragon monsters ridden by One-Ring-sensing warrior kings and their half-mile-wide aura of fear.
However, the reason the Ringbearer did not fly to Mordor by Eagle is fairly simple: the purpose of the Fellowship of the Ring and the linchpin of the entire strategy decided on in Rivendell was to destroy the Ring in a mission of secrecy.
Second, Gandalf could not just “send” the Eagles anywhere. They were autonomous beings who lived far into the Misty Mountains. Being able to find them and ask them would have been time consuming and tedious especially without Radagast.
However, they were afraid of the men of the Vales of Anduin, who shot arrows at the Eagles (including the chief whom Gandalf saved) to keep them from stealing livestock. Therefore, the Eagles took the Company only a short distance.
The Eagles of the Valar are huge, and that's an understatement. Not only would their flight above Mount Doom cause a stir in Sauron's forces, but there is no physical way for Gwaihir to drop the One Ring precisely into the Cracks of Doom.
As for Sam, his resistance likely has to do with his innate goodness and loyalty. His love for Frodo helped him to overcome the pull of the Ring and his inner pureness was never fully pierced by the Ring.
Flying directly into a fully-powerful Mordor would have been little better than a suicide mission, even if Frodo destroyed the Ring in the process. That was something that Gandalf simply would not have asked of him.
Though someone could start out with good intentions, the Ring would eventually corrupt them. And that is why Gandalf can't touch it. He is afraid that if he did, it would corrupt him and make him just as bad as Sauron since Sauron put so much of himself and his evil into the One Ring.
The ring falls into the fires of Doom by accident as Frodo and Gollum fight over it. It is NOT thrown into the fires by intention. It is NOT destroyed intentionally by Frodo or anyone. My take from this is Tolkien had a lesson: That power is immensely corrupting, and not even our hero is immune to its power.
He wasn't truly omnipotent, but his great power allowed him knowledge of many things within the realm. Sauron insisted that the Orcs refer to him as the “Eye” because he did not allow his name to be written or spoken. So when the novels describe the “Eye,” it very well may be a description of Sauron himself.
Frodo asks Gandalf to take the Ring, but the wizard refuses vehemently. With the Ring, Gandalf says, he would become too powerful, and he would inevitably be corrupted like Sauron himself. Even if Gandalf took the Ring simply for safekeeping, the temptation to use it would be too great.
Over his entire journey from Bag End to Mt Doom, Frodo travels approximately 1,800 miles in 185 days. That's an eminently achievable average of 9.73 miles each day.
This question still pesters fans to this day. Of course, the answer is that the Ring Wraiths had creatures that could fly, as revealed in The Two Towers. So this Eagle snobbery is boring and shows a lack of knowledge of the novels. However, Tolkien, as sophisticated as he was, had a simple two-word response: “shut up.”
It is a testament to the Eagle's friendship and loyalty to Gandalf, that they were willing to fly so close to danger for him, and also to Gandalf's belief and faith in the goodness of people winning out over the evil, that he took with him 3 Eagles, in the hopes that Gollum might still be able to be saved, both from ...
Lord of the Rings' Eagles Were Middle-earth's Spies
The original Dark Lord, Morgoth, set up his home in Middle-earth during the First Age. But his brother Manwe wanted to keep an eye on him and created the Eagles as spies. They were given a gift of impressive sight, with the ability to see through physical matter.
Because of their intense love of the earth, the Ring does not sense hobbits as a threat, which is why they were able to be overlooked and complete the quest.
While there were glimpses of it heading toward Mordor, he fully believed that instead of destroying the Ring, the armies of Middle-earth would try to use it against him.
In the film adaptation, however, Gandalf mentions the Blue Wizards but claims he doesn't remember their names. This is actually due to a copyright issue because the names of the Blue Wizards don't appear in the trilogy. In hindsight, another good reason was that maybe adding Radagast into the story was enough.
The reasons for the Elves inviting him are clear given his destruction of the One Ring and Sauron, but Frodo's reasons for accepting are less so. Ultimately, it was the injuries that the ring-bearer Frodo endured on his journey that pushed him to leave Middle-earth.
Other than Frodo, Sam was probably the best member of the Fellowship to bear the Ring. Yet, it was still too much to handle. Judging by the Ring's quick impact on him, it's unlikely Sam would've been able to destroy it. It really goes to show just how terrible a burden the One Ring was.
Why Galadirel Had To Say No To The Ring. Galadriel desired her own kingdom to rule but was not willing to submit to the darkness to obtain it. Her decision meant that she would have to commit to a much more humble lifestyle but she accepted it in order to contribute to the greater good of Middle Earth.
In the spiritual world, beings are invisible to those in the physical world. This is why Isildur, Bilbo, and Frodo become invisible when they wear the Ring—because they are no longer in the physical world. As Olsen said, Sauron does not have a real body, so he is not affected in the same way.
“Mister Frodo” is Sam's way of showing respect to his employer. There is no question that Sam is being respectful toward Frodo but the Shire's aristocratic hierarchy is often overlooked by readers, no doubt because Tolkien rarely mentions it.
When Sam was wearing the ring, why didn't Sauron and the Nazgûl see this and come after him? Because, contrary to what Jackson depicts in his films, the Ring was not a homing beacon - outside of very specific circumstances.