ATCAAAir Traffic Control Assigned Airspace
ATCAAAmador Tuolumne Community Action Agency (Jackson, CA)
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Actually, all sorts of military activity can go on in the ATCAA and, when it does, the military basically owns that air.
There will never be live fire in the ATCAA; a Restricted Area is required for that, and all potentially affected earth beneath the airspace must be either owned or controlled by the military as well.
Another reason ATC might route you around an active ATCAA rather than work you through is that aircraft on maneuvers might not be on an ATC frequency and might not even be squawking a transponder signal ATC can see.
Like an MOA, a cold ATCAA can vanish into procedural non-existence.
ATCAAs usually don't have fixed vertical boundaries, and even if the aircraft in them are operating high up, you might find an issue getting through down low.
Likewise controllers may be hesitant to have the military flight temporarily operate in a specific area of the ATCAA or reduce the altitude block until a non-participant is clear.
When a controller accommodates a non-participant through an ATCAA they certainly add to their workload and responsibilities.
The Pilot/Controller Glossary describes ATCAA as "airspace of defined vertical/lateral limits, assigned by ATC, for the purpose of providing air traffic segregation between the specified activities being conducted within the assigned airspace and other IFR air traffic."
Imagine a flight of two military aircraft operating in an ATCAA and the underlying MOA at 16,000 feet to and including FL220.