Airspace Memory Aid - Rod Machado Watch in HD on YouTube! Share on Facebook! Here's a short video that presents a memory aid graphic that allows you to remember the VFR cloud clearance and visibility requirements for all types of airspace in which you might fly. It only takes about 10 minutes to memorize this graphic. Draw it on a piece of paper a few times and you'll have it down.Learn More about Rod Machado Flight Training! | More Flight Training Videos!