I think this footnote by Tolkien from NoME could be incorporated here, or otherwise in the
Valaquenta:
Quote:
The most notable were those Maiar who took the form of the mighty speaking eagles that we hear of in the legends of the war of the Ñoldor against Melkor, and who remained in the West of Middle-earth until the fall of Sauron and the Dominion of Men, after which they are not heard of again. Their intervention in the story of Maelor, in the duel of Fingolfin and Melkor, in the rescue of Beren and Lúthien is well known. (Beyond their knowledge were the deeds of the Eagles in the war against Sauron: in the rescue of the Ring Finder and his companions, in the Battle of Five Armies, and in the rescue of the Ringbearer from the fires of Mount Doom.)
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The Nature of Middle-earth, 'Manwë's Ban', footnote, p. 308 (from c. 1970 + )
Though I have no idea what the 'story of Maelor' (assuming it means 'Maglor') means. Perhaps Tolkien just conflated him with Maedros.