Mindustry deletong my Siege Sector cause why not showed me two things:
1.: Ship Refabricators are, at the point in the campaign where you fight in Siege the only way of creating flying units, which is why they are the only way of creating them that is banned (i.e.: Ship Assemblers are allowed because you couldnt build them yet as they arent yet researched)
2.: The Sector that bans Air Units is very suspectible to Air Units (total surprise, I know)









