Question: What was formed in 2009 by members of For All We Know and Paddock Park,  Air Traffic or Sleeping with Sirens ?
Sentence (from "Control zone"): A control zone (CTR or controlled traffic region) in aviation is a volume of controlled airspace, normally around an airport, which extends from the "surface" to a "specified upper limit", established to protect air traffic operating to and from that airport.
Relevant evidence: No