sky vs. skies (long post)

[David Bergdahl]

I think as far as weather goes, "skies" recognizes that everyone has his own
patch of sky and the sky may be cloudy for you but clear for me, whereas
when "patrol the sky" considers the [non-count rather than singular] sky as
a unity and the patrol goes everywhere.  So in "Fly the friendly skies" one
understands that United is flying all over the globe, and hence in different
skies, while in "The sky over Dallas is hazy" the perspective is limited to
one patch.
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"Raffiniert ist der Herr Gott, aber Boshaft ist er nicht"
--Albert Einstein