...about this, but I do think that it was Gwaihir, since the previous Lord of
the Eagles, Thorondor had not been seen since the first age...
Perhaps you could say that the rescue from Zirak-zigil was a favour for
Galadriel, not Gandalf, since it was Galadriel who asked him to keep watch on
the mountains for any sign of the company...
I don't think you could say that the rescue from Orthanc was a favour for
Radagast, since that time he was only sent as a messenger, not specifically to
rescue... - unless the Hobbit rescue was by Gwaihir's brother Landroval (it may
have still been to repay the same debt), but I think that is even more
unlikely!
Pure speculation or excuse-making, of course... Don't really know for
sure
"... in storm he delights, and laughs amid the roaring of the waves."
