This is an interesting question,
Eledhewin Ilanora! (Welcome to the Downs, by the way...) Aside from the facetious answer - If they had, there would have been no LotR book/movie! - there have been some previous discussions on this topic, mostly on the Books forum. I'll list the most interesting ones here for those who want to look back and see what serious and humorous notions others have had on the question. However, it's a good idea to begin a new discussion here and to see what answers come up!
The Great Eagle Mystery
Why didn't Frodo use the eagles...
Middle Earth AirForce
Enjoy reading!
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'Mercy!' cried Gandalf. 'If the giving of information is to be the cure of your inquisitiveness, I shall spend all the rest of my days in answering you. What more do you want to know?' 'The whole history of Middle-earth..
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