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10th Jan 2024, 14:26

#7 (permalink)

Wyler

Join Date: Sep 2005

Location: Northumberland

Age: 65

Posts: 748

Likes: 29

Received 6 Likes on 2 Posts

The blocked levels on B1 allowed AD traffic to transit north/south without the need for coordination. Squawking/non squawking not an issue. It was known as the Air Defence Window. Still there today as far as I know.

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