It seems that the Air Mystery Box may be disappeared in Simcity Social, so you shold catch your time to buy what you want.
By AdminTel From Simcity Social Fansite
Air Mystery Box is still available to purchase in SimCity Social but it is a rumour that they may not be around for very much longer so if you haven't taken a gamble at the chance of owning the four special rare animated buildings then now is your chance.
The Air Show, Blimp Hanger, Superhero Monument and Pegasus Grove will all activate a flying animation around your SimCity when placed. The Air show an aeroplane, Blimp Hanger a Blimp, Superhero Monument a Superhero and of course the Pegasus Grove a mystical Pegasus. The perks and boosts for all of these buildings are located below:
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