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Mystery MOA?

I've observed before, and it was true on a recent trip, that when there is an MOA that tops out at 18,000 and I'm at FL 360, that they route me around the MOA. But they are happy enough to route me over/through inactive MOAs. Why?

Ron Lebel

Santa Monica, Calif.

What you got routed around was an Air Traffic Control Assigned Airspace (AT-CAA). These often overlie MOAs and are basically owned by the military when they are active. You won't find them on paper charts as they exist only in Class A airspace so you can't wander into them accidently, but you can find them charted online at

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Title Annotation:READBACK
Author:Lebel, Ron
Article Type:Letter to the editor
Date:Oct 1, 2010
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