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The Plan provides additional general, noise, safety, aircraft protection, and overflight regulations and supporting criteria that apply to each of the compatibility zones.Section 4.2 Compatibility Zone A Compatibility Zone A consists of the Travis AFB runways (the two existing major runways and the ALZ, together with immediately adjoining areas within the runway primary surface and clear zones. The dimensions are set in accordance with Federal Aviation Administration (FAA) and Air Force criteria.Section 4.3 Compatibility Zone B1 Compatibility Zone B1 comprises Accident Potential Zone I (APZ I) as defined by the Air Force. This is an area of substantial risk situated within 7,500 feet of the runway ends. 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