I can give you what I see in my UA
Services guide from the Spring/Summer of 1981.....at that time, OZ
operated out of what was then (and may still be for all I know) Terminal Unit D.....which they shared with UA
, Air Atlantic, Air Florida, Altair, Newair, PI
, and Wings.
Hope this helps.
Tom at MSY
"The criminal ineptitude makes you furious"-Bruce Springsteen, after seeing firsthand the damage from Hurricane Katrina