High volume of pilot training or an unusual type of aerial activity. Military training activities that necessitate acrobatic or abrupt flight maneuvers. Unusual, often invisible, hazards to aircraft such as artillery firing, aerial gunnery, or guided missiles.
Understanding Airspace
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is required to file a flight plan. must use a visual observer. is required to receive ATC authorization.
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The airspace reverts to Class E or a combination of Class E and G airspace during the hours the tower is not in operation. The airspace designation normally will not change.
4000 feet AGL. 1200 feet AGL. 1200 feet MSL.

