An Alert Area depicted on an aeronautical chart indicates:
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Alert Areas are established to inform non-participating pilots of areas containing high volumes of student pilot training or other unusual activities. No authorization is required to enter, unlike Restricted or Prohibited Areas. Both civil and military aircraft share equal collision avoidance responsibility.The trap →
No clearance is required for Alert Areas. This is the key distinction from Restricted and Prohibited Areas. The designation is a warning, not a restriction. "No clearance required" does not mean safe. Student pilots flying unpredictably are a real hazard.SOURCE → FAA AIM Chapter 3CHECKED APR 21ACS II.A.K3EASY