Full FAA Chronology at this link.
19290204: The Aeronautics Branch established a Field Service Section which assumed certain duties performed by the former Airport Section, including assistance to municipalities and other organizations desiring to establish or improve airports. Five airport specialists, including the section chief, toured the U.S. to inspect sites, confer with officials, and address civic groups. The creation of the Field Service Section was part of a general reorganization of the Division of Airports and Aeronautic Information, formerly known as the Information Division, during fiscal 1929. (See November 1929.)
19490204: CAA granted authorization for commercial planes to use ground control approach (GCA) radar as a “primary aid” for bad-weather landings. (See April 9, 1947.)