"Buenos ___!" (4)

(Another definition for aires that I've seen is " Buenos . . . . . is the capital of Argentina".)
I've seen this clue in the USA Today, the LA Times, The New York Times, the King Feature Syndicate, the Universal and The Wall Street Journal.
(Other definitions for dias that I've seen before include "Explorer" , "Raised platform" .)
I've seen this clue in the USA Today, the LA Times and the Penny Press.
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