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 medical, piloting and intelligence tests. The license is renewable periodically, depending upon the class in which it has been issued. These classes include the air transport, limited commercial, industrial, private and student pilot licenses. Each calls for different qualifications, all of which are explained in the Air Commerce Regulations.

"Aircraft are registered in classes according to weight. All craft which operate in interstate commerce or in the furtherance of a business which includes interstate commerce are required to be licensed. All aircraft whether operating in interstate commerce non-commercially or solely within a State must bear identification numbers issued by the department and must obey the air traffic rules contained in the Air Commerce Regulations.

"The Department of Commerce keeps in touch constantly with activities of the manufacturers and of the aerial service and transport