FAA airspace flight zones used around airports to determine laser light brightness limits. From FAA Advisory Circular 70-2, page 22. Valid as of mid-2006.
<a href="//commons.wikimedia.org/wiki/User:Fred_the_Oyster" title="User:Fred the Oyster">Fred the Oyster</a>
2014-10-22
<a href="//commons.wikimedia.org/wiki/File:FAA_airspace-flight-zones.jpg" class="image"><img alt="FAA airspace-flight-zones.jpg" src="https://upload.wikimedia.org/wikipedia/commons/thumb/a/a8/FAA_airspace-flight-zones.jpg/100px-FAA_airspace-flight-zones.jpg" decoding="async" width="100" height="98" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/a/a8/FAA_airspace-flight-zones.jpg/150px-FAA_airspace-flight-zones.jpg 1.5x, https://upload.wikimedia.org/wikipedia/commons/thumb/a/a8/FAA_airspace-flight-zones.jpg/200px-FAA_airspace-flight-zones.jpg 2x" data-file-width="791" data-file-height="774"></a><br>and FAA Advisory Circular 70-2, page 22