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delta is a newly created tag at Travel.SE and is being used like a synonyme for delta-air-lines.
I suggest we make them real synonymes, unless anyone can think of any other use for delta.
I don't have enough rep to create the synonyme.
Done and done. Thanks!
I briefly wondered about 'delta' as in difference between, but ... after 8 years if we haven't had a use for it, I suspect we can deal with that if it comes up.