I should have included. Minimum safe altitude over congested areas 
(cities) and gatherings of people is 1000' AGL, and 500' other areas, 
except some national parks can be higher. The congested has been 
interpreted as to include some little towns at times. Besides 1000' AGL 
isn't a lot of time if there is an engine or propeller failure. With no 
power many light planes will decend at more than 500 fpm, which means 
less than 2 minutes. Grand Canyon has a minimum altitude that can be 
over 10,000' altitude. Maximum altitude, over 12,500' need oxygen, over 
18,000' need air traffic control clearance, be IFR rated plane and pilot.

Carl Denk wrote:
>
>>   Are there designated  
>> corridors for low flying aircraft ( like an autogiro ) to fly in ?
>>   
>>     
>
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