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.

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4000 feet AGL. 1200 feet AGL. 1200 feet MSL.

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is required to file a flight plan. must use a visual observer. is required to receive ATC authorization. 

Class B, C, and D. Class E at 700 and Class E at 1200. Class E 700, Class E 1200, and Class E 14500.

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