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If you choose to become a flight instructor, then you should know that it is going to be very tough but rewarding. In all honesty, when you decide to pursue the course, you may realize that you need to work extra hard so as to get a good rating. Before getting started, then there are some things that you should be aware about.
from: http://ezinearticles.com/?Things-You-Need-to-Know-If-You-Want-to-Be-a-Flight-Instructor&id=9977836